050 550-5.7.1 [2600:xxx::xxxx:xxxx:xxxx:xxxx] Our system has detected that this
050 550-5.7.1 message does not meet IPv6 sending guidelines regarding PTR records
050 550-5.7.1 and authentication. Please review
050 550-5.7.1 https://support.google.com/mail/?p=IPv6AuthError for more information
当尝试通过发送电子邮件时
sendmail -t -v < test.txt
test.txt：
to: tome@gmail.com
from: no-reply@mydomain.com
This is a test of sendmail command line.
.
我在互联网上四处寻找，没有解决方案。我已经在DNS中设置了AAAA根，更新了sendmail并重新启动，但仍然无法接收到该电子邮件。它说它已被接受并被发送。
如何解决此错误？为什么不发送此消息？