Question : Mails sent to one particular domain all go straight to queue. 421 4.4.2 Connection dropped.

We are running Exchange Server 2007 on a member domain with Mailbox, Client Access, and Hub Transport roles installed. Both DC and member domain are running Windows 2003 Server Standard. The problem that we are experiencing which never happened in the past is sending emails to bwaltd.com. All outgoing mails to that domain go directly to queue and bounce back hours later with the message below. I've talked with the Sys Admin of that company and he double and triple checked to make sure that there's nothing on their end that blocks our domain. I do not have SAV installed on the Exchange Server. Our MX record points to mail.lifescapesintl.com. We never had any problem sending e-mails to that domain before but this started occcuring about 2 weeks ago. I can telnet bwaltd.com 25 just fine. Any help would be greatly appreciated. Thank you.


"The recipient e-mail system isn't accepting messages now. Microsoft Exchange will not try to redeliver this message for you. Please try resending this message later, or provide the following diagnostic text to your system administrator.

The following organization rejected your message: es-103.lv.bwaltd.com.

Answer : Mails sent to one particular domain all go straight to queue. 421 4.4.2 Connection dropped.

Upgrading to Exchange Server 2007 SP1 took care of the problem. Thanks for everyone's help.