[exim-dev] [Bug 2908] New: Option to randomise the use of IP…

https://bugs.exim.org/show_bug.cgi?id=2908

            Bug ID: 2908
           Summary: Option to randomise the use of IPv4 and IPv6
           Product: Exim
           Version: N/A
          Hardware: All
                OS: All
            Status: NEW
          Severity: wishlist
          Priority: medium
         Component: Transports
          Assignee: unallocated@???
          Reporter: bugzilla.exim.simon@???
                CC: exim-dev@???

There's hosts_randomize to randomise the order of hosts, and ipv4_prefer to use
IPv4 before IPv6 but there's no option to randomise whether IPv4 or IPv6 is
used.

The reputation of MTAs is often based on its IP address. Hosts with both IPv4
and IPv6 addresses are therefore likely to have two independent reputations.

By preferring one address family over another that reputation can suddenly
change when a retry occurs on the non-preferred address family. It should be
possible to use both IPv4 and IPv6 equally to avoid this problem.

This could improve the adoption of IPv6 for sending email because it avoids the
problems that can occur from rarely using the alternative IPv4 address.

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