Am 14.03.2016 um 12:50 schrieb Pascal Maes:
I would like that everybody who is sending mail from outside our network and 
identified with sasl uses the email address corresponding to the uid.
The mail should be rejected if the uid and the email address do not match.

I think a good start here is SPF and DKIM.
With this you can enforce that now other email server should accept mails thats are not delivered over your email servers with your own domains.

Gruß
Matthias

--

"Programming today is a race between software engineers striving to
build bigger and better idiot-proof programs, and the universe trying to
produce bigger and better idiots. So far, the universe is winning." --
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