need help deciphering a line

2 msg	Postfix SASL Help
6 msg	Slowing down postfix

need help deciphering a line
\ Charlie Farinella (22 Jan 2008)
. \ Victor Duchovni (22 Jan 2008)

4 msg	Postfix SMTP server: errors from something.net[...
4 msg	2.5.0-RC and 2.6 should recognize FreeBSD 8
9 msg	Postfix not following my access file.
3 msg	postfix logs delay, delays, dsn
3 msg	Best way to shutdown postfix prior to servicing...
1 msg	the bounce process hangs a mail (?)
3 msg	messages destined for content_filter stuck in d...
2 msg	Domain in username
5 msg	missing authentication on recipient
5 msg	postfixadmin
5 msg	check_policy_service before reject_rbl_client
9 msg	MXBackup via LDAP
5 msg	header and body check exemptions
5 msg	Relay recipient maps and relocated users
4 msg	mail forwarding loop :: SPAM
3 msg	transport_maps how to match mx's
2 msg	Where/when to insert a missing Message-ID

Subject:	need help deciphering a line
Group:	Postfix-users
From:	Charlie Farinella
Date:	22 Jan 2008

We have a postfix server sending through an ISP relay that works for a
while and then just gets bogged down. We've thought the relay server
becomes unresponsive, but I'm hoping that someone can help me determine
what exactly the following mailq result entry means:

==
5F63112D760 4161 Tue Jan 22 12:59:06 MAILER-DAEMON
(host smtp-out.ispname.net[XXX.XXX.XXX.57] said: 421 Service not
available, closing transmission channel (in reply to RCPT TO command))

8-1007512-mydomain.com?username
==

I don't understand what the last line represents. After the ? is the
address to send to, but what does 8-1007512-mydomain.com mean?

thanks,

--
------------------------------------------------------------------------
Charles Farinella
Appropriate Solutions, Inc. (www.AppropriateSolutions.com)
cfarinella
voice: 603.924.6079 fax: 603.924.8668