传入邮件服务器有证书错误

[Simon_Manning]

如果它从去年 11 月开始，那几乎可以肯定是 Let’s Encrypt 根证书过期了。你只需要拉取新镜像并重新构建即可。

Self-hosted mail-receiver update following Let's Encrypt root certificate change

This announcement only affects self-hosters who are running Configure direct-delivery incoming email for self-hosted sites with Mail-Receiver. Managed hosting customers, and self-hosters using POP3 for incoming mail are not affected. As you may be aware, Let’s Encrypt recently changed their root certificate. The old root certificate expired today, and has caused a number of issues for out-of-date clients across the web. All of our systems at CDCK are up-to-date, and were not affected by today’s…