我在 VPS 上有一个自托管邮件服务器。通过应用程序发送邮件时，我的大部分邮件都被谷歌拒绝。Google 给出了有关该邮件的以下消息。
Reporting-MTA: dns; mail.myclearmargin.com
X-Postcow-Queue-ID: BAC4E881209
X-Postcow-Sender: rfc822; no-reply@myclearmargin.com
Arrival-Date: Mon, 8 Aug 2022 00:03:09 -0700 (PDT)
Final-Recipient: rfc822; alauddin088@gmail.com
Original-Recipient: rfc822;alauddin088@gmail.com
Action: failed
Status: 5.7.25
Remote-MTA: dns; gmail-smtp-in.l.google.com
Diagnostic-Code: smtp; 550-5.7.25 [2a02:c206:2061:6136::1] The IP address
sending this message does not 550-5.7.25 have a PTR record setup, or the
corresponding forward DNS entry does 550-5.7.25 not point to the sending
IP. As a policy, Gmail does not accept 550-5.7.25 messages from IPs with
missing PTR records. Please …