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SMTP error codes - 531

I give up.  What's an SMTP error 531?

For that matter, can anyone find a complete list of Microsoft Exchange SMTP error codes and their meanings?  I can't find a thing that's complete or not entirely vague.  here's an example log entry:

2007-10-03 12:39:38 xxx.xxx.xxx.xxx OutboundConnectionCommand SMTPSVC1 FLEX01 - 25 RCPT - TO:<Some.Guy@somedomain.ca> 0 0 4 0 531 SMTP - - - -

1 Solution
Here is a good site that has SMTP error codes, http://www.networksorcery.com/enp/protocol/smtp.htm

I haven't found anything better.
The problem with SMTP error codes is that are different implementations. They fit in to broad groups, but the terminology is different. Most NDRS that you will see will be generated by Exchange but will not have text that Exchange has created in them - the remote server will have the code.

Basically 2xx is used at the start, 3xx are the codes used during the transmission, 4xx is a temporary failure and 5xx is a permanent failure.

531 I would usually interpret as the remove server is not accepting email. If you are seeing it on the same domain then check the MX records to see if someone has made a mistake. Almost certainly not problem.
Could also be a spam filter's return - I have seen that before.

tomrwilsonAuthor Commented:

Voila.  One list of SMTP error codes.

5.3.1 Mail system full.  Possibly a Standard edition of Exchange reached the 16 GB limit.
PAQed with points refunded (500)

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