I will first admit that I have little experience with configuring/administering Exchange 2007. Our IT Manager is OOF for the week without access to phone/email, so this problem is left on my doorstep :) At some point yesterday (I am guessing around 10AM) we stopped receiving incoming email. Nobody really noticed until this morning when a few people mentioned that their significant others tried to email them yesterday and got no response back. The senders were not getting any bounced mail notification, or delayed delivery notification. It appeared to them that everything was fine. 1. I don't see any NEW errors in the event log on our exchange box. There is one error that keeps coming up every 15 minutes or so (and has for a couple months now it seems): "There is no valid SMTP Transport Layer Security (TLS) certificate for the FQDN of mail.personifydesign.com. The existing certificate for that FQDN has expired. [etc etc]" 2. I already rebooted the email server to make sure there wasn't something that just hiccupped. This didn't help, the same problem still exists. Does anyone have an idea of why I wouldn't be getting external emails? Thanks, ~Joe

Joe,Please try this site to check if a connection can be setup from outside:http://www.emailtalk.org/MailServer.aspxRegards,Johanblog: www.johanveldhuis.nl

Hi Joe, Please run Exchange Remote Connectivity Analyzer https://www.testexchangeconnectivity.com/ to do an Inbound SMTP Email Test, it will guide you some general steps for troubleshooting the issue. If the issue persists, please paste the result here. Please also check the queue (EMC | toolbox | queue viewer), do mails hang there? If so, what’s the error message of the queue? Please let us know your Exchange topology, do you have any firewall/anti-spam software in front of Exchange? Thanks, Elvis