Hi Infra team，
我最近一段时间从SUSE邮箱往openEuler邮件列表发送邮件时，基本都会出现如下错误。
看起来是从我们的邮件服务器（MS Office365云）到openEuler的邮件服务器连接超时。但是经常过几个小时后，邮件又正常出现在邮件列表里面了，看起来经过很长时间之后重试又成功了。但是因此造成邮件的延迟非常高。
请帮忙排查下，谢谢！
Regards,
Kai Liu 刘恺 E-mail: kai.liu@suse.com | Mobile #: +86 186 6591 9086 | TZ: UTC+8
From: post master postmaster@suse.com Date: Tuesday, February 22, 2022 at 15:39 To: Kai Liu kai.liu@suse.com Subject: Your message hasn't been delivered yet
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