Over 25 years, Postfix has accumulated some features that
are essentially obsolete.
- permit_mx_backup is fundamentally incompatible with recipient
address validation. There is no way to work around that with
reject_unverified_recipient, because that requires that a domain
is reachable, and in that case permit_mx_backup is not needed.
Log a deprecation warning with compatibility_levels>=3.9.
- masquerade_domains complicates table-driven address validation.
Log a deprecation warning with compatibility_levels>=3.9.
- disable_dns_lookups can be migrated to smtp_dns_support_level
which implements a superset of the functionality. Log a deprecation
warning with compatibility_levels>=3.9.
What else needs to go?
Wietse
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