Good Afternoon, This is an ongoing problem that I have had no luck at all in finding a solution to.....it started out as a problem sending email to one specific domain, email would hang in the IMC queue for 24 hrs and return undeliverable to the sender, host unreachable....I was very busy at the time, so, I relayed all mail destined for that domain through my ISP's mail server, the problem went away, I forgot about it, etc. Now a different domain can not send mail to my domain, I get event id 4051 from MSExchangeIMC "A timeout occurred while trying to receive mail from `mailserver.domain`and while waiting for the message body." Also, if I look over the firewall logs, I see several 300 second connections from their mail server to mine....is this an Exchange Server IMC issue? Any idea how I can fix this? Any help appreciated.... ******************************************** Scott Overfield Network Administrator Gratiot County Community Mental Health 989-466-4109 soverfield@xxxxxxxxxx