Our company has switched internet providers, and we are finally able to disconnect the old providers equipment (waited until the end of contract). The only part of our infrastructure currently using the old services is Exchange. I've asked our host to update our MX records, and they've added a second MX record to points to the external IP of the new internet provider. I think I've got that covered.
When I change the default gateway of the exchange server to the new internet service, mail is sent externally without issue. Incoming mail is not received though. When I run a smtp test on MXtoolbox to the new IP, I get Failed to Connect with the following transcript:
1/31/2013 9:53:51 AM Connection attempt #1 - Timeout occurred due to inactivity. [16.22 sec]
A port scan on MXToolbox shows Thread aborted.
The fine folks at Sonicwall have told me that the connection is configured properly for Exchange. We have an access rule setup as:
WAN > LAN Source ANY Destination X1 IP Service ExchanceServer Services Allow
The ExchangeServer Services group includes:
HTTPS, IMAP4, POP3 an SMTP.
Any help/suggetions would be greatly appreciated. I'm hoping to get this all moved over on Saturday to minimize the impact on workers in the building.