I have a client running Widnows SBS 2003 R2 who is unable to send email to a couple of domains. They can send email no problem to everyone else. The bounce back message they are receving is
"The following recipient(s) cannot be reached:
email@example.com on 23/10/2008 4:12 PM
Could not deliver the message in the time limit specified. Please retry or contact your administrator.
The log at the other end shows the session just drops. The message on the other end is:
2008-10-23 18:46:12 1Kt8wS-0007rD-3k == firstname.lastname@example.org R=lookuphost T=remote_smtp defer (-18): Remote host mail.barxh.com [18.104.22.168] closed connection in response to end of data
Any ideas would be of great assistance!