我遇到了在别处找不到的奇怪情况。当我在本地机器上向 rcook 发送邮件时，我在系统日志中看到了这个：
Feb 16 20:27:14 linode postfix/pickup[1305]: 326CC4463F: uid=0 from=<root>
Feb 16 20:27:14 linode postfix/cleanup[1524]: 326CC4463F: message-id=<20150217042714.326CC4463F@linode.example.net>
Feb 16 20:27:14 linode postfix/qmgr[1306]: 326CC4463F: from=<root@example.net>, size=302, nrcpt=1 (queue active)
Feb 16 20:27:14 linode postfix/lmtp[1531]: 326CC4463F: to=<rcook@example.net>, orig_to=<rcook>, relay=linode.example.net[private/dovecot-lmtp], delay=0.06, delays=0.04/0.01/0.01/0.01, dsn=5.1.1, status=bounced (host linode.example.net[private/dovecot-lmtp] said: 550 5.1.1 <rcook@example.net> User doesn't exist: rcook@example.net (in reply to RCPT TO command))
Feb 16 20:27:14 linode postfix/bounce[1533]: 326CC4463F: sender non-delivery notification: 3C71844643
Feb 16 20:27:14 linode postfix/qmgr[1306]: 326CC4463F: removed
看起来“rcook”正在被后缀变成“rcook@example.net”。根据我的 main.cf 文件，我正在使用 mysql 查找后缀： …