Check your current logging settings by:
right clicking the SMTP server and slecting properties
make sure enable logging is checkied and remeber the directory the log is saved to
click the properties of the log and then the extended properties
After getting an error open and look at the log.
I wrote a batch program that hunts for return status start with a 5 or 4 and are not = 421
where (substring([cs-uri-query], 1,1) = '4'
or substring([cs-uri-query], 1,1) = '5')
and [cs-uri-query] like '%@%'
and [cs-uri-query] not like '%421%'
Check out
http://www.faqs.org/rfcs/rfc1893.html for error code descriptions.
Also some servers at the major ISPs do not send failure codes, since doing so may give information back to SPAMMERs. Some do send mail back to the errors-to, reply-to, or from addresses.
HTH
-Andy
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