https://bugs.exim.org/show_bug.cgi?id=1141
--- Comment #27 from Dave <exim-cc0@???> ---
(In reply to Jeremy Harris from comment #26)
> 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 [...]".
This doesn't sound right. Internally exim passes the string for and binds to an
IP address, not an interface name. "Physical interface" is quite arbitrary in
this regard, the interfaces in use do not share the same name, and the same
behaviour would be exhibited regardless of whether the interface were physical
or not.
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