ubuntu-18.04 - 邮件服务器无法将我的邮件识别为有效发件人

Question

我正在使用 ubuntu 18.04 服务器。

当我尝试向特定用户发送电子邮件时，发生了此错误：

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

SMTP error from remote mail server after RCPT TO:<wishtosend@domain.com>:
550-Verification failed for <mymail@example.com>
550-The mail server does not recognize mymail@example.com as a valid sender.
550 Sender verify failed

那是什么错误？有什么我可以做的吗？

Answer 1

我按照这里的步骤操作，现在工作正常。