https://bugs.exim.org/show_bug.cgi?id=3146

            Bug ID: 3146
           Summary: smtp transport: option to filter host list
           Product: Exim
           Version: 4.98
          Hardware: All
                OS: All
            Status: NEW
          Severity: wishlist
          Priority: medium
         Component: Transports
          Assignee: unalloca...@exim.org
          Reporter: jgh146...@wizmail.org
                CC: exim-dev@lists.exim.org

Use case: doing ipv4-only to outlook-hosted domains.

The dnslookup router can't filter because the MX result is not known early
enough.
Propose a bool, expanded, option on the smtp transport that can say yes/no for
individual IP addrs resulting from the domain/MX/A lookup sequence.

Considerations: when is the A or AAAA lookup done?  If by the router then the
tpt
gets handed IPs and must (for this usecase) interpret v4 vs. v6.  If by the tpt
then the tpt gets handed names and could just specify v4-only A-lookup
(supporting only the limited usecase.  The "filter" mech above is more flexible
-
could eg. filter by AS or by country.

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