What say your protocol logs? Can you telnet from your hub or edge server (whatever you're using for outbound email delivery) to port 25 on their mail server?
Could also be a DNS issue. You might want to try flushing the cache on your DNS server. From: King's Kid [mailto:kingskid1002...@yahoo.com] Sent: Tuesday, November 30, 2010 8:41 AM To: MS-Exchange Admin Issues Subject: Email delayed going to one specific domain Hi all, Yesterday our Exchange server stopped sending email to one specific domain (our consultant). The only change that was made to the server was I put in a rule regarding the Deleted items folder for our users which I have since deleted. All other emails are being sent correctly and our consultant is receiving emails from other clients. We recently upgraded to this version of Exchange and I'm still learning all the ends and outs. I googled the issue and didn't come up with anything. Any help would be appreciated. We running Exchange 2k7 on Small Business Server 2k8. Thanks BJ When the whole world is against you paranoia is just good sense - Johnny Fever --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com<mailto:listmana...@lyris.sunbeltsoftware.com> with the body: unsubscribe exchangelist ************************************************************************************************** Note: The information contained in this message may be privileged and confidential and protected from disclosure. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by replying to the message and deleting it from your computer. ************************************************************************************************** --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe exchangelist