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On Mon, Oct 11, 2010 at 07:56:40PM +0100, Chris Hills wrote:
> 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.
> email@example.com -> postfix -> ASPMX.L.GOOGLE.com. (user: domain1)
> firstname.lastname@example.org -> postfix -> ASPMX.L.GOOGLE.com. (user: domain2)
This is a SASL issue, not a TLS issue. TLS works the same way in either
case. It sounds like the SASL credentials here are sender-dependent.
You can use the solution described in