Hi all,
Recently i setup an Exchange 2007 server.
Everything is working fine. Only sometimes when one of the users send an email outside of the organisation, the message will be in the queue for a long time.
The error message i get is: "451 4.4.0 primary target IP address responded with: "421 4.4.2 connection dropped".
After a while (sometimes 1 hour, sometimes more then 1 day) the message will be sent.
Does anyone know why this is happening? Most of the time it is happening when sending mail to a certain domain.
Some tips or hints will be very appreciated!
Kind regards,
Tom van Hoof