Hello Marcus, Thanks from the information, as I plan to use some Python scripts latter; but for now, I don't have any Python script. I didn't notice any errors prior to that one, but I did the experiment again to gather the logs exactly as they were and, to my surprise, it just worked. I'm puzzled, not only that started to work, but the main mailserver is claiming "relly denied" for mails sent to its own name.
Thanks. On Thu, 2008-11-13 at 00:11 +0100, Marcus Ilgner wrote: > Hi, > > On Wed, Nov 12, 2008 at 9:37 PM, J. Pablo Fernández <[EMAIL PROTECTED]> wrote: > > Hello. > > > > I've configured a courier to receive email for another courier as a > > backup. When testing it I get the error: > > 556 Address unavailable. > > What does the error mean here? > > > > Does courier perform some kind of DNS check for the MX records (that is > > not set yet)? > > -- > > J. Pablo Fernández <[EMAIL PROTECTED]> http://pupeno.com > > > > incidentally I stumpled upon the same problem today, too. Check for > backscatter suppression, i.e. if there was another error before this > one. > > In my case I found that the dialback module in pythonfilter was having > problems with receiving mails being relayed from my backup MX. > Had to disable it for now. In case anybody has seen this message > before, it was: 400 SMTP class exception during connect > > I took a cursory glance at the source code I found that it splits the > source address into user and domain and then tries to connect to the > MX of the resulting domain. > Quite straightforward, really. Yet, in my case, it looks like every > mail coming in from my backup MX produced the aforementioned error > message while every mail being received directly came through without > problems. > Row 250 in dialback.py was the only place where I found this error > message referenced. Any hints? > And I better mention that sending mail from this server and IP works > fine, too, so it's not the firewall blocking outgoing SMTP. > > Best regards > Marcus -- J. Pablo Fernández <[EMAIL PROTECTED]> http://pupeno.com
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