From: Tom Kovar (postfix_listkovarovi.org)
Date: Mon Jan 01 2007 - 06:34:39 CST

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Hi community,
I have been using successfully Postfix since good one year, and now I
have extended it with SASL, using dovecot, with MySQL in the background
for all authentications. Everything seems to be working fine, when I
send the SMTP commands manually, authentication is successfull and
sending e-mail works according to the rules.
Not so from Micro$oft clients, where I always get "Relay access denied".
Inspecting the Postfix-Syslog, after enabling debug, reveals the source
of the problem - even if I enabled the "SMTP server requires
authentification" check box in these clients, they still do not send the
SMTP AUTH message. The sequence of SMTP messages is
EHLO
MAIL FROM:
RCPT TO:
and this inevitably leads to the failure.

Can anybody help me what the problem with M$ might be?

Thanks, and happy new year,
        --- Tom

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