On 10/25/2010 12:14 AM, t...@diogunix.com wrote:
Noel,

thanks a lot for your help.

Just to precise my need for information:

  >  554 5.7.1
  >  <sil...@foreigndomain.tld>: Relay access denied;

This is the response postfix sent to the remote client.  The
SMTP response is 554 (a permanent error) with an extended code
of 5.7.1, and a text description of what was rejected (the
recipient address) and why (relay access denied).

Is the Email address at exactly that place always (by definition of the
logline format) the recipients Email address ? Or may there be placed any
text information (i.e. in some cases the senders address ) ? The question is
just, how and as what to interpret the information at that part of the
logline.

In the specific case of "Relay access denied" it will always be the recipient address, but there are other reasons for mail to be rejected.

That section of the log line shows "what" was rejected along with a brief text description/reason.

The "what" can be any part of the SMTP envelope; client, HELO, sender, recipient, or in the case of header/body checks, the text that matched the rule.



  -- Noel Jones



We are just struggling to find out if there's a certain problem with
Thunderbird (but almost probably, just the mail user messed up his SMTP
configuration ffor his mail account).

This is most certainly a user configuration error.

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