Ok, two people were nice enough to send me logs of a SMTP session with 
AT&T's mail server.

After looking at the logs, I have to stand by my first assumption, that 
the Network Stream error is being incorrectly indictated by Emailer 
because AT&T is closing the connection before Emailer expects it to.


The problem lies in the fact that AT&T doesn't doesn't wait for an 
acknowledgement to the disconnect request, and instead sends a disconnect 
request and then immediatly drops the connection without waiting. TCP/IP 
sees this as a premature drop, and passes the info on to Emailer as such.

Now, the fault does not lie entirely with AT&T... Emailer should have the 
brains to know that the SMTP session was completed, and the final ok from 
the server was received, and so it should just ignore the fact that the 
actual connection dropped. But it doesn't.

So for all you effected by this, it is 100% safe to ingore the Network 
Stream error, your mail was properly delivered to the mail server, and 
you are seeing an error resulting from the minor details of who is 
disconnecting first and if they are waiting for a confirmation from the 
other end.

-chris
<http://www.mythtech.net>

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