问题就是发邮件发不出去（收可以收到，比如QQ邮箱）~无论是roundcubemail还是foxmail发都不行
因为我看是阿里云屏蔽了25端口，然后我看日志也发现是25端口连接超时了，不确定是不是这个原因。
所以不知道该怎么设置~因为我记得我只是开启了SMTPS，关了amavis，但是没有动其他的部分。

以下信息包含了mail.log、main.cf和master.cf

发送一个新邮件后的mail.log如下————————————————————————————————————————
Apr  8 22:18:14 mail postfix/smtps/smtpd[2007]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:18:14 mail postfix/smtps/smtpd[2007]: connect from unknown[185.29.8.10]
Apr  8 22:18:15 mail postfix/smtps/smtpd[2007]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:18:18 mail postfix/smtps/smtpd[2128]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:18:18 mail postfix/smtps/smtpd[2128]: disconnect from unknown[185.29.8.10]
Apr  8 22:18:21 mail postfix/smtps/smtpd[2135]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:18:21 mail postfix/smtps/smtpd[2135]: connect from unknown[185.29.8.10]
Apr  8 22:18:21 mail postfix/smtps/smtpd[2135]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:18:24 mail postfix/smtps/smtpd[2007]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:18:24 mail postfix/smtps/smtpd[2007]: disconnect from unknown[185.29.8.10]
Apr  8 22:18:25 mail postfix/smtps/smtpd[2135]: warning: unknown[185.29.8.10]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr  8 22:18:25 mail postfix/smtps/smtpd[2135]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:18:25 mail postfix/smtps/smtpd[2135]: disconnect from unknown[185.29.8.10]
Apr  8 22:18:25 mail postfix/smtps/smtpd[2128]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:18:25 mail postfix/smtps/smtpd[2128]: connect from unknown[185.29.8.10]
Apr  8 22:18:26 mail postfix/smtps/smtpd[2128]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:18:31 mail postfix/smtps/smtpd[2128]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:18:31 mail postfix/smtps/smtpd[2128]: disconnect from unknown[185.29.8.10]
Apr  8 22:18:31 mail postfix/smtps/smtpd[2007]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:18:31 mail postfix/smtps/smtpd[2007]: connect from unknown[185.29.8.10]
Apr  8 22:18:32 mail postfix/smtps/smtpd[2007]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:18:37 mail postfix/smtps/smtpd[2007]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:18:37 mail postfix/smtps/smtpd[2007]: disconnect from unknown[185.29.8.10]
Apr  8 22:18:37 mail postfix/smtps/smtpd[2066]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:18:37 mail postfix/smtps/smtpd[2066]: connect from unknown[185.29.8.10]
Apr  8 22:18:37 mail postfix/smtps/smtpd[2066]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:18:41 mail postfix/smtps/smtpd[2066]: warning: unknown[185.29.8.10]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr  8 22:18:48 mail postfix/smtps/smtpd[2066]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:18:48 mail postfix/smtps/smtpd[2066]: disconnect from unknown[185.29.8.10]
Apr  8 22:18:49 mail postfix/smtps/smtpd[2135]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:18:49 mail postfix/smtps/smtpd[2135]: connect from unknown[185.29.8.10]
Apr  8 22:18:49 mail postfix/smtps/smtpd[2135]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:18:55 mail postfix/smtps/smtpd[2135]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:18:55 mail postfix/smtps/smtpd[2135]: disconnect from unknown[185.29.8.10]
Apr  8 22:18:55 mail postfix/smtps/smtpd[2007]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:18:55 mail postfix/smtps/smtpd[2007]: connect from unknown[185.29.8.10]
Apr  8 22:18:55 mail postfix/smtps/smtpd[2007]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:18:59 mail postfix/smtps/smtpd[2007]: warning: unknown[185.29.8.10]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr  8 22:19:00 mail postfix/smtps/smtpd[2007]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:19:00 mail postfix/smtps/smtpd[2007]: disconnect from unknown[185.29.8.10]
Apr  8 22:19:02 mail postfix/smtps/smtpd[2128]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:19:02 mail postfix/smtps/smtpd[2128]: connect from unknown[185.29.8.10]
Apr  8 22:19:06 mail postfix/smtps/smtpd[2128]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:19:10 mail postfix/submission/smtpd[2336]: connect from mail.pkumun.org.cn[127.0.0.1]
Apr  8 22:19:10 mail postfix/submission/smtpd[2336]: Anonymous TLS connection established from mail.pkumun.org.cn[127.0.0.1]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:19:10 mail postfix/submission/smtpd[2336]: D7CA98176F: client=mail.pkumun.org.cn[127.0.0.1], sasl_method=LOGIN, sasl_username=zhouhongbo@pkumun.org.cn
Apr  8 22:19:10 mail postfix/cleanup[2343]: D7CA98176F: message-id=<0d2c681b923e058dc104adffb045ea71@pkumun.org.cn>
Apr  8 22:19:10 mail postfix/qmgr[1388]: D7CA98176F: from=<zhouhongbo@pkumun.org.cn>, size=744, nrcpt=1 (queue active)
Apr  8 22:19:10 mail roundcube: <46fvknkd> User zhouhongbo@pkumun.org.cn [115.27.217.183]; Message for 345598726@qq.com; 250: 2.0.0 Ok: queued as D7CA98176F
Apr  8 22:19:10 mail postfix/submission/smtpd[2336]: disconnect from mail.pkumun.org.cn[127.0.0.1]
Apr  8 22:19:13 mail postfix/smtps/smtpd[2128]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:19:13 mail postfix/smtps/smtpd[2128]: disconnect from unknown[185.29.8.10]
Apr  8 22:19:15 mail postfix/smtps/smtpd[2066]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:19:15 mail postfix/smtps/smtpd[2066]: connect from unknown[185.29.8.10]
Apr  8 22:19:15 mail postfix/smtps/smtpd[2066]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:19:19 mail postfix/smtps/smtpd[2066]: warning: unknown[185.29.8.10]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr  8 22:19:19 mail postfix/smtps/smtpd[2066]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:19:19 mail postfix/smtps/smtpd[2066]: disconnect from unknown[185.29.8.10]
Apr  8 22:19:20 mail postfix/smtps/smtpd[2135]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:19:20 mail postfix/smtps/smtpd[2135]: connect from unknown[185.29.8.10]
Apr  8 22:19:20 mail postfix/smtps/smtpd[2135]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:19:25 mail postfix/smtps/smtpd[2135]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:19:25 mail postfix/smtps/smtpd[2135]: disconnect from unknown[185.29.8.10]
Apr  8 22:19:25 mail postfix/smtps/smtpd[2007]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:19:25 mail postfix/smtps/smtpd[2007]: connect from unknown[185.29.8.10]
Apr  8 22:19:26 mail postfix/smtps/smtpd[2007]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:19:31 mail postfix/smtps/smtpd[2007]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:19:31 mail postfix/smtps/smtpd[2007]: disconnect from unknown[185.29.8.10]
Apr  8 22:19:31 mail postfix/smtps/smtpd[2128]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:19:31 mail postfix/smtps/smtpd[2128]: connect from unknown[185.29.8.10]
Apr  8 22:19:31 mail postfix/smtps/smtpd[2128]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:19:35 mail postfix/smtps/smtpd[2128]: warning: unknown[185.29.8.10]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr  8 22:19:35 mail postfix/smtps/smtpd[2128]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:19:35 mail postfix/smtps/smtpd[2128]: disconnect from unknown[185.29.8.10]
Apr  8 22:19:36 mail postfix/smtps/smtpd[2135]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:19:36 mail postfix/smtps/smtpd[2135]: connect from unknown[185.29.8.10]
root@mail:/var/log# cat mail.log
Apr  8 22:18:14 mail postfix/smtps/smtpd[2007]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:18:14 mail postfix/smtps/smtpd[2007]: connect from unknown[185.29.8.10]
Apr  8 22:18:15 mail postfix/smtps/smtpd[2007]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:18:18 mail postfix/smtps/smtpd[2128]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:18:18 mail postfix/smtps/smtpd[2128]: disconnect from unknown[185.29.8.10]
Apr  8 22:18:21 mail postfix/smtps/smtpd[2135]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:18:21 mail postfix/smtps/smtpd[2135]: connect from unknown[185.29.8.10]
Apr  8 22:18:21 mail postfix/smtps/smtpd[2135]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:18:24 mail postfix/smtps/smtpd[2007]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:18:24 mail postfix/smtps/smtpd[2007]: disconnect from unknown[185.29.8.10]
Apr  8 22:18:25 mail postfix/smtps/smtpd[2135]: warning: unknown[185.29.8.10]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr  8 22:18:25 mail postfix/smtps/smtpd[2135]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:18:25 mail postfix/smtps/smtpd[2135]: disconnect from unknown[185.29.8.10]
Apr  8 22:18:25 mail postfix/smtps/smtpd[2128]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:18:25 mail postfix/smtps/smtpd[2128]: connect from unknown[185.29.8.10]
Apr  8 22:18:26 mail postfix/smtps/smtpd[2128]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:18:31 mail postfix/smtps/smtpd[2128]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:18:31 mail postfix/smtps/smtpd[2128]: disconnect from unknown[185.29.8.10]
Apr  8 22:18:31 mail postfix/smtps/smtpd[2007]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:18:31 mail postfix/smtps/smtpd[2007]: connect from unknown[185.29.8.10]
Apr  8 22:18:32 mail postfix/smtps/smtpd[2007]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:18:37 mail postfix/smtps/smtpd[2007]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:18:37 mail postfix/smtps/smtpd[2007]: disconnect from unknown[185.29.8.10]
Apr  8 22:18:37 mail postfix/smtps/smtpd[2066]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:18:37 mail postfix/smtps/smtpd[2066]: connect from unknown[185.29.8.10]
Apr  8 22:18:37 mail postfix/smtps/smtpd[2066]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:18:41 mail postfix/smtps/smtpd[2066]: warning: unknown[185.29.8.10]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr  8 22:18:48 mail postfix/smtps/smtpd[2066]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:18:48 mail postfix/smtps/smtpd[2066]: disconnect from unknown[185.29.8.10]
Apr  8 22:18:49 mail postfix/smtps/smtpd[2135]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:18:49 mail postfix/smtps/smtpd[2135]: connect from unknown[185.29.8.10]
Apr  8 22:18:49 mail postfix/smtps/smtpd[2135]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:18:55 mail postfix/smtps/smtpd[2135]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:18:55 mail postfix/smtps/smtpd[2135]: disconnect from unknown[185.29.8.10]
Apr  8 22:18:55 mail postfix/smtps/smtpd[2007]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:18:55 mail postfix/smtps/smtpd[2007]: connect from unknown[185.29.8.10]
Apr  8 22:18:55 mail postfix/smtps/smtpd[2007]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:18:59 mail postfix/smtps/smtpd[2007]: warning: unknown[185.29.8.10]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr  8 22:19:00 mail postfix/smtps/smtpd[2007]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:19:00 mail postfix/smtps/smtpd[2007]: disconnect from unknown[185.29.8.10]
Apr  8 22:19:02 mail postfix/smtps/smtpd[2128]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:19:02 mail postfix/smtps/smtpd[2128]: connect from unknown[185.29.8.10]
Apr  8 22:19:06 mail postfix/smtps/smtpd[2128]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:19:10 mail postfix/submission/smtpd[2336]: connect from mail.pkumun.org.cn[127.0.0.1]
Apr  8 22:19:10 mail postfix/submission/smtpd[2336]: Anonymous TLS connection established from mail.pkumun.org.cn[127.0.0.1]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:19:10 mail postfix/submission/smtpd[2336]: D7CA98176F: client=mail.pkumun.org.cn[127.0.0.1], sasl_method=LOGIN, sasl_username=zhouhongbo@pkumun.org.cn
Apr  8 22:19:10 mail postfix/cleanup[2343]: D7CA98176F: message-id=<0d2c681b923e058dc104adffb045ea71@pkumun.org.cn>
Apr  8 22:19:10 mail postfix/qmgr[1388]: D7CA98176F: from=<zhouhongbo@pkumun.org.cn>, size=744, nrcpt=1 (queue active)
Apr  8 22:19:10 mail roundcube: <46fvknkd> User zhouhongbo@pkumun.org.cn [115.27.217.183]; Message for 345598726@qq.com; 250: 2.0.0 Ok: queued as D7CA98176F
Apr  8 22:19:10 mail postfix/submission/smtpd[2336]: disconnect from mail.pkumun.org.cn[127.0.0.1]
Apr  8 22:19:13 mail postfix/smtps/smtpd[2128]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:19:13 mail postfix/smtps/smtpd[2128]: disconnect from unknown[185.29.8.10]
Apr  8 22:19:15 mail postfix/smtps/smtpd[2066]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:19:15 mail postfix/smtps/smtpd[2066]: connect from unknown[185.29.8.10]
Apr  8 22:19:15 mail postfix/smtps/smtpd[2066]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:19:19 mail postfix/smtps/smtpd[2066]: warning: unknown[185.29.8.10]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr  8 22:19:19 mail postfix/smtps/smtpd[2066]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:19:19 mail postfix/smtps/smtpd[2066]: disconnect from unknown[185.29.8.10]
Apr  8 22:19:20 mail postfix/smtps/smtpd[2135]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:19:20 mail postfix/smtps/smtpd[2135]: connect from unknown[185.29.8.10]
Apr  8 22:19:20 mail postfix/smtps/smtpd[2135]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:19:25 mail postfix/smtps/smtpd[2135]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:19:25 mail postfix/smtps/smtpd[2135]: disconnect from unknown[185.29.8.10]
Apr  8 22:19:25 mail postfix/smtps/smtpd[2007]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:19:25 mail postfix/smtps/smtpd[2007]: connect from unknown[185.29.8.10]
Apr  8 22:19:26 mail postfix/smtps/smtpd[2007]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:19:31 mail postfix/smtps/smtpd[2007]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:19:31 mail postfix/smtps/smtpd[2007]: disconnect from unknown[185.29.8.10]
Apr  8 22:19:31 mail postfix/smtps/smtpd[2128]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:19:31 mail postfix/smtps/smtpd[2128]: connect from unknown[185.29.8.10]
Apr  8 22:19:31 mail postfix/smtps/smtpd[2128]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:19:35 mail postfix/smtps/smtpd[2128]: warning: unknown[185.29.8.10]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr  8 22:19:35 mail postfix/smtps/smtpd[2128]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:19:35 mail postfix/smtps/smtpd[2128]: disconnect from unknown[185.29.8.10]
Apr  8 22:19:36 mail postfix/smtps/smtpd[2135]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:19:36 mail postfix/smtps/smtpd[2135]: connect from unknown[185.29.8.10]
Apr  8 22:19:37 mail postfix/smtps/smtpd[2135]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:19:40 mail postfix/smtp[2305]: connect to mx3.qq.com[183.57.48.35]:25: Connection timed out
Apr  8 22:20:10 mail postfix/smtp[2305]: connect to mx2.qq.com[183.60.15.138]:25: Connection timed out
Apr  8 22:20:13 mail postfix/smtps/smtpd[2135]: warning: unknown[185.29.8.10]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr  8 22:20:13 mail postfix/smtps/smtpd[2135]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:20:13 mail postfix/smtps/smtpd[2135]: disconnect from unknown[185.29.8.10]
Apr  8 22:20:14 mail postfix/smtps/smtpd[2007]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:20:14 mail postfix/smtps/smtpd[2007]: connect from unknown[185.29.8.10]
Apr  8 22:20:14 mail postfix/smtps/smtpd[2007]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:20:20 mail postfix/smtps/smtpd[2066]: warning: hostname ip-8-10.dataclub.biz does not resolve to address 185.29.8.10: Name or service not known
Apr  8 22:20:20 mail postfix/smtps/smtpd[2066]: connect from unknown[185.29.8.10]
Apr  8 22:20:23 mail postfix/smtps/smtpd[2066]: Anonymous TLS connection established from unknown[185.29.8.10]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Apr  8 22:20:23 mail postfix/smtps/smtpd[2007]: lost connection after AUTH from unknown[185.29.8.10]
Apr  8 22:20:23 mail postfix/smtps/smtpd[2007]: disconnect from unknown[185.29.8.10]

我的main.cf文件如下：----------------------------------------------------------------------------------------------------

#
# INSTALL-TIME CONFIGURATION INFORMATION
#
# location of the Postfix queue. Default is /var/spool/postfix.
queue_directory = /var/spool/postfix

# location of all postXXX commands. Default is /usr/sbin.
command_directory = /usr/sbin

# location of all Postfix daemon programs (i.e. programs listed in the
# master.cf file). This directory must be owned by root.
# Default is /usr/libexec/postfix
daemon_directory = /usr/lib/postfix

# location of Postfix-writable data files (caches, random numbers).
# This directory must be owned by the mail_owner account (see below).
# Default is /var/lib/postfix.
data_directory = /var/lib/postfix

# owner of the Postfix queue and of most Postfix daemon processes.
# Specify the name of a user account THAT DOES NOT SHARE ITS USER OR GROUP ID
# WITH OTHER ACCOUNTS AND THAT OWNS NO OTHER FILES OR PROCESSES ON THE SYSTEM.
# In particular, don't specify nobody or daemon. PLEASE USE A DEDICATED USER.
# Default is postfix.
mail_owner = postfix

# The following parameters are used when installing a new Postfix version.
#
# sendmail_path: The full pathname of the Postfix sendmail command.
# This is the Sendmail-compatible mail posting interface.
#
sendmail_path = /usr/sbin/sendmail

# newaliases_path: The full pathname of the Postfix newaliases command.
# This is the Sendmail-compatible command to build alias databases.
#
newaliases_path = /usr/bin/newaliases

# full pathname of the Postfix mailq command.  This is the Sendmail-compatible
# mail queue listing command.
mailq_path = /usr/bin/mailq

# group for mail submission and queue management commands.
# This must be a group name with a numerical group ID that is not shared with
# other accounts, not even with the Postfix account.
setgid_group = postdrop

# external command that is executed when a Postfix daemon program is run with
# the -D option.
#
# Use "command .. & sleep 5" so that the debugger can attach before
# the process marches on. If you use an X-based debugger, be sure to
# set up your XAUTHORITY environment variable before starting Postfix.
#
debugger_command =
    PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
    ddd $daemon_directory/$process_name $process_id & sleep 5

debug_peer_level = 2

# --------------------
# CUSTOM SETTINGS
#

# SMTP server response code when recipient or domain not found.
unknown_local_recipient_reject_code = 550

# Do not notify local user.
biff = no

# Disable the rewriting of "site!user" into "user@site".
swap_bangpath = no

# Disable the rewriting of the form "user%domain" to "user@domain".
allow_percent_hack = no

# Allow recipient address start with '-'.
allow_min_user = no

# Disable the SMTP VRFY command. This stops some techniques used to
# harvest email addresses.
disable_vrfy_command = yes

# Enable both IPv4 and/or IPv6: ipv4, ipv6, all.
inet_protocols = ipv4

# Enable all network interfaces.
inet_interfaces = all

#
# TLS settings.
#
# SSL key, certificate, CA
#
smtpd_tls_key_file = /etc/ssl/private/server.key
smtpd_tls_cert_file = /etc/ssl/certs/server.crt
smtpd_tls_CAfile = /etc/ssl/certs/server.ca-bundle

#
# Disable SSLv2, SSLv3
#
smtpd_tls_protocols = !SSLv2 !SSLv3
smtpd_tls_mandatory_protocols = !SSLv2 !SSLv3
smtp_tls_protocols = !SSLv2 !SSLv3
smtp_tls_mandatory_protocols = !SSLv2 !SSLv3
lmtp_tls_protocols = !SSLv2 !SSLv3
lmtp_tls_mandatory_protocols = !SSLv2 !SSLv3

#
# Fix 'The Logjam Attack'.
#
smtpd_tls_exclude_ciphers = aNULL, eNULL, EXPORT, DES, RC4, MD5, PSK, aECDH, EDH-DSS-DES-CBC3-SHA, EDH-RSA-DES-CDC3-SHA, KRB5-DE5, CBC3-SHA
smtpd_tls_dh512_param_file = /etc/ssl/dh512_param.pem
smtpd_tls_dh1024_param_file = /etc/ssl/dh2048_param.pem

tls_random_source = dev:/dev/urandom

# Log only a summary message on TLS handshake completion — no logging of client
# certificate trust-chain verification errors if client certificate
# verification is not required. With Postfix 2.8 and earlier, log the summary
# message, peer certificate summary information and unconditionally log
# trust-chain verification errors.
smtp_tls_loglevel = 1
smtpd_tls_loglevel = 1

# Opportunistic TLS: announce STARTTLS support to remote SMTP clients, but do
# not require that clients use TLS encryption.
smtpd_tls_security_level = may

# Produce `Received:` message headers that include information about the
# protocol and cipher used, as well as the remote SMTP client CommonName and
# client certificate issuer CommonName.
# This is disabled by default, as the information may be modified in transit
# through other mail servers. Only information that was recorded by the final
# destination can be trusted.
#smtpd_tls_received_header = yes

# Opportunistic TLS, used when Postfix sends email to remote SMTP server.
# Use TLS if this is supported by the remote SMTP server, otherwise use
# plaintext.
# References:
#   - http://www.postfix.org/TLS_README.html#client_tls_may
#   - http://www.postfix.org/postconf.5.html# … rity_level
smtp_tls_security_level = may

# Use the same CA file as smtpd.
smtp_tls_CAfile = $smtpd_tls_CAfile
smtp_tls_note_starttls_offer = yes

# Enable long, non-repeating, queue IDs (queue file names).
# The benefit of non-repeating names is simpler logfile analysis and easier
# queue migration (there is no need to run "postsuper" to change queue file
# names that don't match their message file inode number).
#enable_long_queue_ids = yes

# Reject unlisted sender and recipient
smtpd_reject_unlisted_recipient = yes
smtpd_reject_unlisted_sender = yes

# Header and body checks with PCRE table
header_checks = pcre:/etc/postfix/header_checks
body_checks = pcre:/etc/postfix/body_checks.pcre

# A mechanism to transform commands from remote SMTP clients.
# This is a last-resort tool to work around client commands that break
# interoperability with the Postfix SMTP server. Other uses involve fault
# injection to test Postfix's handling of invalid commands.
# Requires Postfix-2.7+.
#smtpd_command_filter = pcre:/etc/postfix/command_filter.pcre

# HELO restriction
smtpd_helo_required = yes
smtpd_helo_restrictions =
    permit_mynetworks
    permit_sasl_authenticated
    reject_non_fqdn_helo_hostname
    reject_unknown_helo_hostname
    check_helo_access pcre:/etc/postfix/helo_access.pcre

# Sender restrictions
smtpd_sender_restrictions =
    reject_unknown_sender_domain
    reject_non_fqdn_sender
    reject_unlisted_sender
    permit_mynetworks
    permit_sasl_authenticated
    check_sender_access pcre:/etc/postfix/sender_access.pcre

# Recipient restrictions
smtpd_recipient_restrictions =
    reject_unknown_recipient_domain
    reject_non_fqdn_recipient
    reject_unlisted_recipient
    check_policy_service inet:127.0.0.1:7777
    permit_mynetworks
    permit_sasl_authenticated
    reject_unauth_destination

# END-OF-MESSAGE restrictions
smtpd_end_of_data_restrictions =
    check_policy_service inet:127.0.0.1:7777

# Data restrictions
smtpd_data_restrictions = reject_unauth_pipelining

proxy_read_maps = $canonical_maps $lmtp_generic_maps $local_recipient_maps $mydestination $mynetworks $recipient_bcc_maps $recipient_canonical_maps $relay_domains $relay_recipient_maps $relocated_maps $sender_bcc_maps $sender_canonical_maps $smtp_generic_maps $smtpd_sender_login_maps $transport_maps $virtual_alias_domains $virtual_alias_maps $virtual_mailbox_domains $virtual_mailbox_maps $smtpd_sender_restrictions $sender_dependent_relayhost_maps

# Avoid duplicate recipient messages. Default is 'yes'.
enable_original_recipient = no

# Virtual support.
virtual_minimum_uid = 2000
virtual_uid_maps = static:2000
virtual_gid_maps = static:2000
virtual_mailbox_base = /var/vmail

# Do not set virtual_alias_domains.
virtual_alias_domains =

#
# Enable SASL authentication on port 25 and force TLS-encrypted SASL authentication.
# WARNING: NOT RECOMMENDED to enable smtp auth on port 25, all end users should
#          be forced to submit email through port 587 instead.
#
#smtpd_sasl_auth_enable = yes
#smtpd_sasl_security_options = noanonymous
#smtpd_tls_auth_only = yes

# hostname
myhostname = mail.pkumun.org.cn
myorigin = mail.pkumun.org.cn
mydomain = mail.pkumun.org.cn

# trusted SMTP clients which are allowed to relay mail through Postfix.
#
# Note: additional IP addresses/networks listed in mynetworks should be listed
#       in iRedAPD setting 'MYNETWORKS' (in `/opt/iredapd/settings.py`) too.
#       for example:
#
#       MYNETWORKS = ['xx.xx.xx.xx', 'xx.xx.xx.0/24', ...]
#
mynetworks = 127.0.0.1

# Accepted local emails
mydestination = $myhostname, localhost, localhost.localdomain

alias_maps = hash:/etc/postfix/aliases
alias_database = hash:/etc/postfix/aliases

# Default message_size_limit.
message_size_limit = 104857600

# The set of characters that can separate a user name from its extension
# (example: user+foo), or a .forward file name from its extension (example:
# .forward+foo).
# Postfix 2.11 and later supports multiple characters.
recipient_delimiter = +

# The time after which the sender receives a copy of the message headers of
# mail that is still queued. Default setting is disabled (0h) by Postfix.
#delay_warning_time = 1h
#
# Lookup virtual mail accounts
#
transport_maps =
    proxy:mysql:/etc/postfix/mysql/transport_maps_user.cf
    proxy:mysql:/etc/postfix/mysql/transport_maps_domain.cf

sender_dependent_relayhost_maps =
    proxy:mysql:/etc/postfix/mysql/sender_dependent_relayhost_maps.cf

# Lookup table with the SASL login names that own the sender (MAIL FROM) addresses.
smtpd_sender_login_maps =
    proxy:mysql:/etc/postfix/mysql/sender_login_maps.cf

virtual_mailbox_domains =
    proxy:mysql:/etc/postfix/mysql/virtual_mailbox_domains.cf

relay_domains =
    $mydestination
    proxy:mysql:/etc/postfix/mysql/relay_domains.cf

virtual_mailbox_maps =
    proxy:mysql:/etc/postfix/mysql/virtual_mailbox_maps.cf

virtual_alias_maps =
    proxy:mysql:/etc/postfix/mysql/virtual_alias_maps.cf
    proxy:mysql:/etc/postfix/mysql/domain_alias_maps.cf
    proxy:mysql:/etc/postfix/mysql/catchall_maps.cf
    proxy:mysql:/etc/postfix/mysql/domain_alias_catchall_maps.cf

sender_bcc_maps =
    proxy:mysql:/etc/postfix/mysql/sender_bcc_maps_user.cf
    proxy:mysql:/etc/postfix/mysql/sender_bcc_maps_domain.cf

recipient_bcc_maps =
    proxy:mysql:/etc/postfix/mysql/recipient_bcc_maps_user.cf
    proxy:mysql:/etc/postfix/mysql/recipient_bcc_maps_domain.cf

#
# Postscreen
#
postscreen_greet_action = enforce
postscreen_blacklist_action = enforce
postscreen_dnsbl_action = enforce
postscreen_dnsbl_threshold = 2
postscreen_dnsbl_sites =
    zen.spamhaus.org=127.0.0.[2..11]*3
    b.barracudacentral.org=127.0.0.[2..11]*2

postscreen_dnsbl_reply_map = texthash:/etc/postfix/postscreen_dnsbl_reply
postscreen_access_list = permit_mynetworks cidr:/etc/postfix/postscreen_access.cidr

# Require Postfix-2.11+
postscreen_dnsbl_whitelist_threshold = -2
#
# Dovecot SASL support.
#
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/dovecot-auth
virtual_transport = dovecot
dovecot_destination_recipient_limit = 1

#
# Amavisd + SpamAssassin + ClamAV
#
# content_filter = smtp-amavis:[127.0.0.1]:10024

# Concurrency per recipient limit.
smtp-amavis_destination_recipient_limit = 1
mailbox_size_limit = 104857600

master.cf文件如下：----------------------------------------------------------------------------------------------------
#
# Postfix master process configuration file.  For details on the format
# of the file, see the master(5) manual page (command: "man 5 master" or
# on-line: http://www.postfix.org/master.5.html).
#
# Do not forget to execute "postfix reload" after editing this file.
#
# ==========================================================================
# service type  private unpriv  chroot  wakeup  maxproc command + args
#               (yes)   (yes)   (yes)   (never) (100)
# ==========================================================================
#smtp      inet  n       -       -       -       -       smtpd
smtp      inet  n       -       -       -       1       postscreen
smtpd     pass  -       -       -       -       -       smtpd
dnsblog   unix  -       -       -       -       0       dnsblog
tlsproxy  unix  -       -       -       -       0       tlsproxy
#submission inet n       -       -       -       -       smtpd
#  -o syslog_name=postfix/submission
#  -o smtpd_tls_security_level=encrypt
#  -o smtpd_sasl_auth_enable=yes
#  -o smtpd_reject_unlisted_recipient=no
#  -o smtpd_client_restrictions=$mua_client_restrictions
#  -o smtpd_helo_restrictions=$mua_helo_restrictions
#  -o smtpd_sender_restrictions=$mua_sender_restrictions
#  -o smtpd_recipient_restrictions=
#  -o smtpd_relay_restrictions=permit_sasl_authenticated,reject
#  -o milter_macro_daemon_name=ORIGINATING
#smtps     inet  n       -       -       -       -       smtpd
#  -o syslog_name=postfix/smtps
#  -o smtpd_tls_wrappermode=yes
#  -o smtpd_sasl_auth_enable=yes
#  -o smtpd_reject_unlisted_recipient=no
#  -o smtpd_client_restrictions=$mua_client_restrictions
#  -o smtpd_helo_restrictions=$mua_helo_restrictions
#  -o smtpd_sender_restrictions=$mua_sender_restrictions
#  -o smtpd_recipient_restrictions=
#  -o smtpd_relay_restrictions=permit_sasl_authenticated,reject
#  -o milter_macro_daemon_name=ORIGINATING
#628       inet  n       -       -       -       -       qmqpd
pickup    unix  n       -       -       60      1       pickup
cleanup   unix  n       -       -       -       0       cleanup
qmgr      unix  n       -       n       300     1       qmgr
#qmgr     unix  n       -       n       300     1       oqmgr
tlsmgr    unix  -       -       -       1000?   1       tlsmgr
rewrite   unix  -       -       -       -       -       trivial-rewrite
bounce    unix  -       -       -       -       0       bounce
defer     unix  -       -       -       -       0       bounce
trace     unix  -       -       -       -       0       bounce
verify    unix  -       -       -       -       1       verify
flush     unix  n       -       -       1000?   0       flush
proxymap  unix  -       -       n       -       -       proxymap
proxywrite unix -       -       n       -       1       proxymap
smtp      unix  -       -       -       -       -       smtp
relay     unix  -       -       -       -       -       smtp
#       -o smtp_helo_timeout=5 -o smtp_connect_timeout=5
showq     unix  n       -       -       -       -       showq
error     unix  -       -       -       -       -       error
retry     unix  -       -       -       -       -       error
discard   unix  -       -       -       -       -       discard
local     unix  -       n       n       -       -       local
virtual   unix  -       n       n       -       -       virtual
lmtp      unix  -       -       -       -       -       lmtp
anvil     unix  -       -       -       -       1       anvil
scache    unix  -       -       -       -       1       scache
#
# ====================================================================
# Interfaces to non-Postfix software. Be sure to examine the manual
# pages of the non-Postfix software to find out what options it wants.
#
# Many of the following services use the Postfix pipe(8) delivery
# agent.  See the pipe(8) man page for information about ${recipient}
# and other message envelope options.
# ====================================================================
#
# maildrop. See the Postfix MAILDROP_README file for details.
# Also specify in main.cf: maildrop_destination_recipient_limit=1
#
maildrop  unix  -       n       n       -       -       pipe
  flags=DRhu user=vmail argv=/usr/bin/maildrop -d ${recipient}
#
# ====================================================================
#
# Recent Cyrus versions can use the existing "lmtp" master.cf entry.
#
# Specify in cyrus.conf:
#   lmtp    cmd="lmtpd -a" listen="localhost:lmtp" proto=tcp4
#
# Specify in main.cf one or more of the following:
#  mailbox_transport = lmtp:inet:localhost
#  virtual_transport = lmtp:inet:localhost
#
# ====================================================================
#
# Cyrus 2.1.5 (Amos Gouaux)
# Also specify in main.cf: cyrus_destination_recipient_limit=1
#
#cyrus     unix  -       n       n       -       -       pipe
#  user=cyrus argv=/cyrus/bin/deliver -e -r ${sender} -m ${extension} ${user}
#
# ====================================================================
# Old example of delivery via Cyrus.
#
#old-cyrus unix  -       n       n       -       -       pipe
#  flags=R user=cyrus argv=/cyrus/bin/deliver -e -m ${extension} ${user}
#
# ====================================================================
#
# See the Postfix UUCP_README file for configuration details.
#
uucp      unix  -       n       n       -       -       pipe
  flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
#
# Other external delivery methods.
#
ifmail    unix  -       n       n       -       -       pipe
  flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)
bsmtp     unix  -       n       n       -       -       pipe
  flags=Fq. user=bsmtp argv=/usr/lib/bsmtp/bsmtp -t$nexthop -f$sender $recipient
scalemail-backend unix    -    n    n    -    2    pipe
  flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store ${nexthop} ${user} ${extension}
mailman   unix  -       n       n       -       -       pipe
  flags=FR user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py
  ${nexthop} ${user}

# Submission, port 587, force TLS connection.
submission inet n       -       n       -       -       smtpd
  -o syslog_name=postfix/submission
  -o smtpd_tls_security_level=encrypt
  -o smtpd_sasl_auth_enable=yes
  -o smtpd_client_restrictions=permit_sasl_authenticated,reject
#  -o content_filter=smtp-amavis:[127.0.0.1]:10026

  #-o smtpd_upstream_proxy_protocol=haproxy

# Use dovecot's `deliver` program as LDA.
dovecot unix    -       n       n       -       -      pipe
    flags=DRh user=vmail:vmail argv=/usr/lib/dovecot/deliver -f ${sender} -d ${user}@${domain} -m ${extension}

# Amavisd integration.
smtp-amavis unix -  -   n   -   2  smtp
    -o syslog_name=postfix/smtp-amavis
    -o smtp_data_done_timeout=1200
    -o smtp_send_xforward_command=yes
    -o disable_dns_lookups=yes
    -o max_use=20

127.0.0.1:10025 inet n  -   n   -   -  smtpd
    -o syslog_name=postfix/10025
    -o content_filter=
    -o mynetworks_style=host
    -o mynetworks=127.0.0.0/8
    -o local_recipient_maps=
    -o relay_recipient_maps=
    -o strict_rfc821_envelopes=yes
    -o smtp_tls_security_level=none
    -o smtpd_tls_security_level=none
    -o smtpd_restriction_classes=
    -o smtpd_delay_reject=no
    -o smtpd_client_restrictions=permit_mynetworks,reject
    -o smtpd_helo_restrictions=
    -o smtpd_sender_restrictions=
    -o smtpd_recipient_restrictions=permit_mynetworks,reject
    -o smtpd_end_of_data_restrictions=
    -o smtpd_error_sleep_time=0
    -o smtpd_soft_error_limit=1001
    -o smtpd_hard_error_limit=1000
    -o smtpd_client_connection_count_limit=0
    -o smtpd_client_connection_rate_limit=0
    -o receive_override_options=no_header_body_checks,no_unknown_recipient_checks,no_address_mappings
    #-o smtpd_upstream_proxy_protocol=haproxy
465     inet  n       -       n       -       -       smtpd
  -o syslog_name=postfix/smtps
  -o smtpd_tls_wrappermode=yes
  -o smtpd_sasl_auth_enable=yes
  -o smtpd_client_restrictions=permit_sasl_authenticated,reject

郵件伺服器的防火牆 , 465 port 開了沒?