Config. MTA to relay e-mails based on "From"-header [solved]

[tobr]

Hello,

I’ve got a bit of an unusual problem. I’d like my MTA (exim at the moment, but I don’t insist on using it) to deliver mail in my LAN in the usual way but as soon as a "From"-header like "foobar@gmail.com" is used I’d like it to send the e-mail via "smtp.gmail.com". I’d prefer this because then I didn’t have to configure every MUA I happen to use at the moment (I can’t decide ) for all my e-mail addresses.

Is something like that even possible? Is the MTA the wrong "layer" to do it?

Thanks in advance for any answers/thoughts/ideas. Links to docs would also be appreciated, I didn’t really know what to search for.
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[overkll]

Postfix can do it. IMHO its the best SMTP server out there. You may not find an EXACT howto, but there are many howtos for this type of config with postfix on the net. I've combined at least 10 howtos into my postfix config over the years.

Try googling:

"postfix transport isp gmail password"

or

"postfix password maps"

One can map multiple domains and/or users to differnent smtp servers/relays with postfix.

Here's a couple of example howto's
http://linuxgazette.net/115/chirico1.html
http://wiki.slicehost.com/doku.php?id=authenticate_postfix_to_upstream_relay

They may not be exactly what you are looking for, but they do cover the gmail mapping/authentication part.

[tobr]

I also found the following on the postfix web site: http://www.postfix.org/postconf.5.html#sender_dependent_relayhost_maps, which seems to be exactly what I want.

Thank you!
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[GNUix]

It could be accomplished relatively easy using Exim's ACL system.