Exchange not receiving outside email

Posted on 2010-11-09
Last Modified: 2012-06-27
I have an exchange2007 server that had to have the router, firewall and switch rebooted this morning to to no network connectivity.  These reboots caused the email server to not be able to receive mail from external sources(i.e. yahoo, hotmail).  Internal email works fine.  I've rebooted the server once and stopped and restarted ALL exchange services twice and still nothing.  What am I missing.
Question by:excell-tec

Expert Comment

ID: 34096500
have you change IPs?
LVL 20

Expert Comment

ID: 34096556
If using Cisco are you sure you saved the rules?   If not sounds like you lost the rule set for NAT for SMTP.  

What type of firewall and do you see any rules for SMTP forwarding to your Exchange server?   does your exchange server have internet access?
LVL 17

Expert Comment

by:Viral Rathod
ID: 34096636
Please go to and Run the Inbound SMTP E-Mail Test

You will see the error
Letus know the results .
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Assisted Solution

jamie_gillespie earned 333 total points
ID: 34097275
External IP could have changed causing problem with MX

Assisted Solution

TAMUG earned 167 total points
ID: 34097345
Or if your IP change is your Edge Transport server or your Spam Firewall server not communicating with your Hub or Cas (HubCas) server.

Accepted Solution

jamie_gillespie earned 333 total points
ID: 34097366
Needs diagnosing a slight bit more

Author Closing Comment

ID: 34111380
All great solutions but it was a Firebox reboot issue causing outside communication issues with the server.  Everything was getting out but emails weren't getting in.  Internet was getting in but not emails and that is what the baffling part was.  Thanks for your help all.

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