On Fri, Dec 11, 2009 at 04:16:40PM +0100, Udo Rader wrote:
> Umar Draz wrote:
>
>> I have postfix server with SMTP authentication.
>> My client's are using MS outlook for sending/receiving emails.
>> my domain name is = foo.com
>> but i am facing a very strange problem. If someone change his/her identity
>> like (u...@foo.com) to u...@yahoo.com. Then my mail server send his/her
>> email as u...@yahoo.com anywhere.
>> Would you please help how i can stop this. I want user only sent outgoing
>> email using my domain name.
>
> http://www.postfix.org/postconf.5.html#reject_unknown_sender_domain
No, because "yahoo.com", for example, is not "uknown". Since the OP
uses SASL auth, he could try to make headway with:
http://www.postfix.org/postconf.5.html#reject_sender_login_mismatch
this can break use-cases where the authenticated client is an MTA,
forwarding email for multiple users or another domain.
--
Viktor.
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