From: Ignacio Garcia (igpoenus.com)
Date: Thu Jun 04 2009 - 10:52:10 CDT

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Hi there.

We have a couple of servers handling thousands of messages a day. We
noticed that some of our users will use their autheticated account to
send messages from other valid accounts not sitting in our servers. By
using smtpd_reject_unlisted_sender = yes we solve the problem partially
by not letting users to use an incorrect local email account to send
messages. However, is there a way to prevent local authenticated users
sending email with valid hotmail or gmail accounts through our smtp
servers? We cannot use reject_authenticated_sender_login_mismatch since
some of our business customers have their own intranet email servers
doing smtp authenticated relays.

Thanks in advance

Ignacio
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