Hey there,

I am going crazy trying to figure out this problem with our server. Randomly over the weekend our exchange server decided to stop delivering emails to users inside the organization sent from users outside the organization. We are able to send emails internally as well as externally but nothing on the way back.

I have run a a lot of tests including the mail delivery tool in Exchange 2010. I have also checked the DNS and for some reason in the SBS Console a lot of computers are considered "Offline" or "Online - Unable to query computer for more information" ect.

This is a critical part of our business and I am running out of options to check for issues.