So i searched this forum already and trioed several things.
The problem i have is that since i upgraded a server from 2003 -> 2011 inclusing exchange some people can't email to us. They will send a email and after 24 hours they get it back! Note* its only like 5% of the people, the others CAN send email... but the 5% are suppliers and very important.
What i've alreacy tried:
- Restarting the computers and server
- I have nothing blocked in exchange
- Completly reinstalled exhange WITHOUT importing stuff from the old server.
Can someone please help because it's really annoying right now.
Thanx for the help :)