https://bugs.exim.org/show_bug.cgi?id=1141
--- Comment #26 from Jeremy Harris <jgh146exb@???> ---
It's been long enough that I've forgotten the issue details... but I suspect
you are assuming that by asking for a specific IP in an smtp transport
"interface" option, that IP will be used. Wrong. The IP is only used to
select the interface. If there's only one interface that happens to have
several IPs, that interface is still the interface that it used. Which IP
gets used for packets is up to the OS.
That's why the option is "interface" and not "IPADDRESS" (or similar). The
documentation says:
"This option specifies which interface to bind to when
making an outgoing SMTP call."
It does not say "This option sets the local IP address to use when [...]".
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