我已经设置了 Postfix 并创建了一个映射到 Gmail 帐户的别名。当我从我自己的一个（谷歌邮件）帐户发送邮件时，它会通过，但如果来自外部的人给我发邮件，谷歌将不会接受来自我服务器的邮件。日志内容包含以下内容：
Aug 20 13:47:09 Ubuntu-1204-precise-64-minimal postfix/smtpd[8249]: connect from mailout.example.com[1.1.1.1]
Aug 20 13:47:09 Ubuntu-1204-precise-64-minimal postfix/smtpd[8249]: DB399E3318: client=mailout.example.com[1.1.1.1]
Aug 20 13:47:09 Ubuntu-1204-precise-64-minimal postfix/cleanup[8253]: DB399E3318: message-id=<015e01ce9d9a$f988a750$ec99f5f0$@dk>
Aug 20 13:47:09 Ubuntu-1204-precise-64-minimal postfix/qmgr[8230]: DB399E3318: from=<test@example.com>, size=3813, nrcpt=1 (queue active)
Aug 20 13:47:09 Ubuntu-1204-precise-64-minimal postfix/smtpd[8249]: disconnect from mailout.example.com[1.1.1.1]
Aug 20 13:47:10 Ubuntu-1204-precise-64-minimal postfix/smtp[8255]: DB399E3318: to=<example@gmail.com>, orig_to=<example@mydomain.com>, relay=gmail-smtp-in.l.google.com[2a00:1450:4010:c04::1b]:25, delay=1.1, delays=0.22/0/0.14/0.76, dsn=5.7.1, status=bounced (host gmail-smtp-in.l.google.com[2a00:1450:4010:c04::1b] said: 550-5.7.1 [2a01:4f8:d12:11c2::2 16] The sender does not meet basic ipv6 550-5.7.1 sending guidelines of authentication and rdns resolution …