I have just realized why PTR record is really important. Many different people set different security settings on my mail server. What happen is that I found my mail server is rejected by several server because it’s missing PTR record. When my mail server connect to remote mail server, they only know my IP. In order to confirm my identity, they do a reverse lookup on my IP address to make sure that I’m sending on behalf of my domain only. This is one of the method to reduce spam, but it was causing havoc on my mail server. On the bright side, only several mail server are doing this.
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