On Sun, Sep 29, 2024 at 07:26:25PM +0000, Exim Bugzilla via Exim-dev wrote:
> There is no point in attempting delivery to additional IPs for the same MTA if
> a message has been rejected. The additional IPs should be used only to recover
> from a connection failure.
The notion of "the same MTA" is rather questionable these days. Many
apparently multi-homed MX hosts are just IPs of separate machines lumped
under a single name for convenience.
Exim is far from alone in trying a second MX host IP address (regardless
of whether the hostname is the same or not) when a recipient tempfails.
Postfix will do exactly the same, though the count of MX host live
connections tried before deferring the message defaults to two (up to 5
addresses for TCP connection attempts, but only two delivery attempts
once a connection succeeds).
--
Viktor.
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