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Exchange not receiving outside email

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.
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excell-tec
Asked:
excell-tec
3 Solutions
 
TAMUGCommented:
have you change IPs?
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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
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?
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Viral RathodConsultantCommented:
Please go to https://www.testexchangeconnectivity.com/ and Run the Inbound SMTP E-Mail Test

You will see the error
Letus know the results .
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Jamie GillespieSenior IT ConsultantCommented:
External IP could have changed causing problem with MX
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TAMUGCommented:
Or if your IP change is your Edge Transport server or your Spam Firewall server not communicating with your Hub or Cas (HubCas) server.
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Jamie GillespieSenior IT ConsultantCommented:
Needs diagnosing a slight bit more
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excell-tecAuthor Commented:
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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