postfix-users October 2010 archive
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postfix-users: NOQUEUE Relay Access denied

NOQUEUE Relay Access denied

From: <tom_at_nospam>
Date: Mon Oct 25 2010 - 01:13:49 GMT

Hello everybody,

postfix user since neraly two years approximately (runs like a swiss
cloickwork, THANKS to developers) but now I have a question I could not
resolve via reading the documentation:

My question is not about Postfix configuration but only on how to read
Postfix' loglines.

I have a mail user with obviously a mixed up MUA setup (Thunderbird). This
mail user cannot send out Email to any Email address belonging to foreign
mail servers. He only succeeds to send Email to users on the same mailserver

The principal problem (wrong MUA settings) is clear but I just would like to
fully understand the related postfix logline 100% right (to be able to give
more DETAILED advice to this MUA user.

My Email user is myuser@homedomain.tld (my mailservers)
He wants to send an Email to silver@foreigndomain.tld (foreign mail server)

Here's the logline in question:

Oct 24 22:38:36 mail postfix/smtpd[91510]: NOQUEUE: reject: RCPT from[]: 554 5.7.1
<silver@foreigndomain.tld>: Relay access denied;
from=<myuser@homedomain.tld> to=<silver@foreigndomain.tld> proto=ESMTP

So three times an Email address is mentioned in this logline. The meaning of
the second occuremce ("... from=<myuser@homedomain.tld> ...") and third
occurence (".... to=<silver@foreigndomain.tld> ...")is clear. I just don't
get the exact meaning of the first occurence of an Email address.

Now the actual question:

Does the FIRST occurence of an Email address ( "... 554 5.7.1
<silver@foreigndomain.tld>: Relay access denied ...") mean, that my client
tried to smtp auth himself as mailbox user silver@foreign.tld ?

Does this then mean that wrongfully this MUA setup has silver@foreign.tld in
the mail accounts configuration instead of myuser@homedomain.tld ?

In this case, I had an approval on the wromg MUA setup. My postfix
configuration does exactly what it has to do: reject foreign users to avoid
being an open relay.

Many thanks in advance !