My exchange server is not sending outside mails.While i tried diagnostic logging i got event viewer warning Like This "Message delivery to the remote domain 'hotmail.com' failed for the following reason: The connection was dropped by the remote host." But some other remote addresses are going without any delay.problem started from yesterday 31-12-01. Server DNS resolution is working fine. I am able to recieve mails and send mails to some outside addresses.But problem with some addresses like, hotmail.com, yahoo.co.in, etc. I spoke to our ISP regarding any type of blocking from their end and they said there is no problem.Internet browsing is working fine for all sites. any one have any sugestion on on this. regards Aboo Arif