Public bug reported:
Builds from courier-mta sources prior to 20211111 have two bugs:
1) parsing bug in the bofh badfrom check
2) rejects null MX records when validing the sending IP address against
the sender's HELO/EHLO identifier
#2 is causing Yahoo mail with null MX dns records to be rejected. Yahoo
is a major player in the email world and this should be considered a
priority
Recommend that new .deb binary be generated using courier-mta 20211111
or later.
1) Bionic Beaver
2) courier-mta-0.78.0-2ubuntu2
3) expect all mail from Yahoo to be delivered
4) mail with null MX dns records are being rejected
** Affects: courier (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1966318
Title:
courier-mta rejects Yahoo mail with null MX dns records
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