pulling out email addresses

[Adam Lanier]

On Fri, 2004-01-09 at 11:03, Douglas Furlong wrote:
> Unfortunately the number of different mail servers AND configurations of
> said mail servers is quite astounding. To be honest the best two servers
> to deal with are Sendmail and Exchange. The error messages provided by
> these two mail servers are relatively consistent (may be because
> sendmail admins appreciate consistency, and exchange admins don't know
> any better ;)).
> So the biggest problem your going to have is to work out whether or not
> the response is a fatal error, or one of the other ones. If you are
> happy with doing that, then some thing as simple as a shell script could
> be run on a specific mail box, or listed as the mail alias, so that it
> is processed as it came in to the mail system.
> 
> Dougie
> 

RFC 2821 (also see RFC 821) specify response codes for MTA's.  To some
degree, these codes are fixed (top level codes, i.e. 550).  Sub-level
codes are implementation specific which means they could (and do) vary
from MTA to MTA.  

The response codes are included in any bounce message, you should be
able to determine (at a minimum) whether they response was a temporary
or permanent failure. 
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