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- iRedMail 版本号：9.6
- 使用哪个数据库存储用户帐号MySQL
- 使用的 Linux/BSD 发行版名称及版本号：centos 6
- 与您的问题相关的日志信息：
un 26 16:11:19 mail amavis[716]: (00716-03) Passed CLEAN {RelayedInternal}, ORIGINATING LOCAL [202.5.22.19]:62838 [202.5.22.19] <admin@qingtingzj.com> -> <562787484@qq.com>, Message-ID: , mail_id: 07b5Wody7onL, Hits: -, size: 959, queued_as: 0BDF5AE37AE, dkim_new=dkim:qingtingzj.com, 109 ms
Jun 26 16:11:19 mail postfix/smtp-amavis/smtp[1954]: DCA72AE22FD: to=<562787484@qq.com>, relay=127.0.0.1[127.0.0.1]:10026, delay=0.17, delays=0.05/0/0/0.12, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as 0BDF5AE37AE)
Jun 26 16:11:19 mail postfix/qmgr[1192]: DCA72AE22FD: removed
Jun 26 16:11:19 mail postfix/qmgr[1192]: DCA72AE22FD: removed
Jun 26 16:11:49 mail postfix/smtp[1962]: connect to mx3.qq.com[2001:df6:f400::2808]:25: Connection timed out
Jun 26 16:11:50 mail postfix/smtp[1962]: setting up TLS connection to mx3.qq.com[184.105.206.32]:25
Jun 26 16:11:50 mail postfix/smtp[1962]: Trusted TLS connection established to mx3.qq.com[184.105.206.32]:25: TLSv1.2 with cipher AES128-SHA256 (128/128 bits)
Jun 26 16:11:50 mail postfix/smtp[1960]: setting up TLS connection to mx3.qq.com[184.105.206.32]:25
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通过iredmail向163等邮箱发送邮件时，都能很快接收到，但发给qq邮箱接受速度要延迟30s以上
在maillog中发现向qq邮箱发送时，会先以普通连接方式发送，但连接超时：
connect to mx3.qq.com[2001:df6:f400::2808]:25: Connection timed out
随后才以tls方式发送，请问有什么办法让他强制tls方式发送么？