Jan Engelhardt a écrit :
You are confusing incoming with outgoing connections.
Yes, my mistake.
correct. For the incoming one you bind to [::]:25, for the outgoing one you bind to [2a01::desired]:0. Problem solved.
What would happend for v4 destinations ? Both v4/v6 destinations may exist at the same time.
And somewhere in between is /etc/gai.conf.
Yes, this allows to change the ordering of the rules (RFC 5014 if I am correct), but not to add a specific rule depending on various parameters (destination, owner, etc.) at all.
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