OMFG, I just received a bounce from an e-mail I sent 6 months ago.
The mail was written to postmasters, complaining about their MTA's not understanding 45x codes. Sounds like that is just the beginning of their problems...
/me wonders if that "lost connection" was 6 months ago, or ran for 6 months before it got lost...
This is the Postfix program at host gs-smta-01.broadbandscope.net.
I'm sorry to have to inform you that your message could not be be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to <postmaster>
If you do so, please include this problem report. You can delete your own text from the attached returned message.
<email@example.com>: lost connection with mail.sfd.co.uk[18.104.22.168] while sending message body
From: Stefano Rivera <XXXXX@rivera.za.net>
Subject: Misconfigured mailservers (greylist incompatible)
To: firstname.lastname@example.org, email@example.com, firstname.lastname@example.org
Date: Mon, 17 Jul 2006 15:47:17 +0200
Sorry, but you guys have no technical contact listed anywhere, so I just mailed all the relevant postmasters.
Your outgoing mail servers don't seem to retry mail when they get temporary errors (45x series). The problem servers for me were gs-mta-04.broadbandscope.net [22.214.171.124] and gs-mta-03.broadbandscope.net [126.96.36.199].