==== 必填信息。没有填写将不予回复 ====
- iRedMail 版本号：iRedmail 0.8.7
- 使用哪个数据库存储用户帐号（OpenLDAP，MySQL，PostgreSQL）：MYSQL
- 使用的 Linux/BSD 发行版名称及版本号：Centos 6.5
- 与您的问题相关的日志信息：
Dec 22 15:52:38 mail postfix/smtp[7889]: D1BA7362318: to=<tangwei1313@hotmail.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=3.4, delays=0.19/0.02/0/3.2, 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 1DF6E36231B)
Dec 22 15:52:38 mail postfix/qmgr[2206]: D1BA7362318: removed
Dec 22 15:52:40 mail postfix/smtp[7913]: 1DF6E36231B: to=<tangwei1313@hotmail.com>, relay=mx2.hotmail.com[65.55.37.120]:25, delay=2, delays=0.04/0.02/1.5/0.42, dsn=5.0.0, status=bounced (host mx2.hotmail.com[65.55.37.120] said: 550 Requested action not taken: mailbox unavailable (in reply to RCPT TO command))
Dec 22 15:52:40 mail postfix/cleanup[7884]: 3CD7A362320: message-id=<20141222075240.3CD7A362320@mail.vcotech.cn>
Dec 22 15:52:40 mail postfix/bounce[7914]: 1DF6E36231B: sender non-delivery notification: 3CD7A362320
Dec 22 15:52:40 mail postfix/qmgr[2206]: 3CD7A362320: from=<>, size=3134, nrcpt=1 (queue active)
Dec 22 15:52:40 mail postfix/qmgr[2206]: 1DF6E36231B: removed
Dec 22 15:52:40 mail postfix/pipe[7915]: 3CD7A362320: to=<tangwei@fengjingba.net>, relay=dovecot, delay=0.16, delays=0.03/0.01/0/0.12, dsn=2.0.0, status=sent (delivered via dovecot service)
Dec 22 15:52:40 mail postfix/qmgr[2206]: 3CD7A362320: removed
====

看日志意思，是和myhostname 有关，我添加的域名还是用原来设置好的myhostname，所以被判退！
请问，我需要设置什么呢？