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https://bugs.exim.org/show_bug.cgi?id=2922

--- Comment #1 from Jeremy Harris <jgh146exb@wizmail.org> ---
Assuming you mean "random among the addresses of the interface"
that's working as designed. Your transport config only selects the interface
(hence the name of the option).

--- Comment #2 from regiment <radu@romania-it.com> ---
Hi Jeremy, yes that is correct. I have one interface that has like 15 IPv6
addresses attached/assigned to it.

So what you are telling me if i create a new interface and assign it only one
IPV6 address and change the exim config to only use that particular interface
for ipv6 transport basicaly that would solve this issue?

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https://bugs.exim.org/show_bug.cgi?id=2922

--- Comment #3 from Jeremy Harris <jgh146exb@wizmail.org> ---
So long as it's a "real" interface and not some form of alias, that would
work. But I suspect you'd need an actual separate NIC for that.

We're pretty much at the whim of what the kernel does, with the current
coding - it being only intended to select an interface to use.

A more-specific local bind could be done in theory, but we'd have to
invent new config syntax for that to be requested. I'm not sure there's
enough need for such a feature.

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https://bugs.exim.org/show_bug.cgi?id=2922

Arkadiusz Miskiewicz <arekm@maven.pl> changed:

What |Removed |Added
----------------------------------------------------------------------------
CC| |arekm@maven.pl

--- Comment #4 from Arkadiusz Miskiewicz <arekm@maven.pl> ---
In normal case, if getaddrinfo is used for address selection then
https://www.ietf.org/rfc/rfc3484.html#page-10 applies and getaddrinfo gets
these rules from /etc/gai.conf

http://biplane.com.au/blog/?p=30

But exim doesn't use getaddrinfo for binding afaik.

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