Public bug reported:
Postfix 3.4.10-1ubuntu1
Xubuntu 20.04
smtpd_sender_restrictions = check_sender_mx_access
smtpd_sender_restrictions = check_sender_ns_access
Rules - tried hash and regexp - sometimes work, but usually not. Related
to this, mail from nonexistent domains or with missing MX and/or A
records usually, but not always, rejected (despite placement of
reject_unknown_sender_domain or rules in check_sender_mx_access).
The same rules work as expected when applied to the A record using:
smtpd_sender_restrictions = check_sender_access
** Affects: postfix (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1883584
Title:
MX and NS Sender Access Checks - Unreliable
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