邮件服务器无法将我的邮件识别为有效发件人
Mail server does not recognize my mail as a valid sender
我正在使用 ubuntu 18.04 服务器。
当我试图向特定用户发送电子邮件时，发生了这个错误：
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
那个错误是什么？
有什么我可以做的吗？
我按照 here 中的步骤操作，现在运行良好。
我正在使用 ubuntu 18.04 服务器。
当我试图向特定用户发送电子邮件时，发生了这个错误：
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
那个错误是什么？ 有什么我可以做的吗？
我按照 here 中的步骤操作，现在运行良好。