One of my clients moved premises this last weekend.
They run a simple SBS 2003 server with a 15 user network.
Everything was moved over successfully. The only real change we had to make was our static IP address, as we were moving to a different ADSL line and changing our ISP.
Since the move though, a couple of users have reported email being bounced back from addresses they could email OK in the old location. There are several bounce message variants, but the one that gives the most information is as follows;
The following recipient(s) could not be reached:
Horn, Simone on 19/10/2010 13:59
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<ourdomain.co.uk #5.5.0 smtp;550 No RDNS entry for xx.xx.xx.xx>
where the x's indicate our new static IP address.
I've looked up this error message and the universal answer is to contact the ISP and get the MX records changed for the domain to reflect the reverse DNS lookup.
However, in this case I'm a bit confused, as to my knowledge, our server has never physically been linked with our email domain in this way. When somebody sends an email out from the organization, it is sent out through our server. To receive email, we have set up POP3 mailboxes on the domain which our server polls, then collects and distributes to Exchange. I know the POP3 method isn't ideal, but any idea how to sort out the email bouncing first?