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The situation is thus:-
I wish to provide a v6-to-v4 relay for two different domains using the
same postfix process. Mail for the domains is hosted by google, so the
destination host will be ASPMX.L.GOOGLE.com. for both domains. However,
recently my ipv4 provider has blocked outgoing tcp:25 so now I must use
tcp:587 using TLS and authentication. The problem is that I need to use
two different credentials depending upon the domain for which the
message is being relayed.
firstname.lastname@example.org -> postfix -> ASPMX.L.GOOGLE.com. (user: domain1)
email@example.com -> postfix -> ASPMX.L.GOOGLE.com. (user: domain2)
How do I configure this?