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Setting up a mailserver on OpenBSD 6.9: Further testing
M. More testing
The acid test is now to send mail to one of your accounts at Google, Microsoft, Apple/iCloud, and others like ATT/Yahoo. If the message is received in your mailbox and not flagged as Spam/Junk, that's great. Now, reply to the message and look to see if the reply shows up in your mailbox of the newly commissioned mail server.
If not, go back to some of the tests detailed above. Here are some instructions which can be helpful. Display and read the headers and check DKIM both ways or use a DKIM validation tool. Recheck the DNS configuration and reverse DNS. CheckTLS (https://www.checktls.com/howto.html#Deeper) and Hardenize (https://www.hardenize.com/) have online tools which can be helpful in pointing out problems. Make sure the mail is not getting trapped by rspamd (use the web ui to see the details).
Good luck!
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Posted by Gordon, No Hair Github Pages, August 24, 2021
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