Our students use the domain "ccol.ac.uk" and the staff "central-glasgow.ac.uk". From a student account I can send and receive email to and from external systems such as Gmail and Hotmail. I can send email to staff accounts on GroupWise. The only problem I am having is sending email from GroupWise to Scalix.When I send an email I get back:
The message that you sent was undeliverable to the following:
testuser@ccol.ac.uk (550 Relaying denied)
Both servers are on a NATed network (10.40.0.0/24) behind a BorderManager firewall. We use CopperFasten (a mail filtering solution build upon Span Assassin and Clam Antivirus) to filter out junk and clean out viruses and forward email to the correct server. We have both internal and external DNS servers and I have removed all references to MX records from the internal DNS servers.
Tie is running out for us as we are about to create all the network accounts for our newly enrolled students next week. Any help in solving this problem will be greatly appreciated.