inbound/outbound emails not working

[magicman]

I've had Scalix 11 Community working for about 6 weeks. Four days ago I moved the physical location of my server and switched ISPs. The server worked for three days and then suddenly today, I can't get emails to or from people outside the network. Internally (to/from people on the Scalix server) emails seem to be ok. I don't have the foggiest idea where to begin debugging this problem. Here's what I've tried:

I can telnet from off the network into the SMTP server - hence, the firewall is not blocking that port
I can send an email internally via Outlook/Outlook Connector and it works
I can NOT send an email out to an address not on my network
I can NOT send an email from outside the network/domain to an address inside my domain

The ports for SMTP, HTTP, and HTTPS are open as I can 1) telnet to the SMTP server, and 2) access SWA from outside the network.

When sending an email to an account on the Scalix server from an 3rd party email service, the email service does not return an error even though the user does not get the email. Likewise, when a Scalix user sends an email out, there is no error but the recipient never gets it.

Thoughts?

[jaime.pinto]

do a "whois" on your domain
find the primary and secondary name servers listed there.

do a "dig -t MX" on those servers, and verify that they point to *your* current server, i.e, the IPs you currently use.

Then get a shell on any external system and do a "telnet your_IP 143" (for example), and then a "telnet yoursaclixserver.domain.com 143"

tell us what happens