We recently moved all of our offices over to a Private Network which went well with all offices instantly having access to their emails and network shares.
We also successfully repointed all services to the new IP addresses with external email being delivered, webmail being presented etc
Also internal email is flowing fine.
The problem is whenever anyone tries to send an external email we get a bounceback:
Subject: Test external
Could not be delivered because of
550 REJ-RELAY-001: relay not permitted
The following recipients were affected:
Original Sender: <XXX.XXX@XXXXX.co.uk>
Last-Attempt-Date: <08:26:54 Fri, 18 April 2014>"
So SERVER1 is our main Exchange 2003 box that is in Head Office, SERVER2 is in a satellite office (we also have a SERVER3 in another office).
We also have Mailmarshal in place for our Anti-spam solution.
All offices have an internet connection, all servers are set up in System Manager to be allowed to relay.
I've made sure the new ISP has set up a PTR record which was the same as the previous fixed IP we used for Head Office.
So am at a bit of a loss now...