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ITKE
16,755 pts.
 Not receiving external emails on Exchange Server
Cisco PIX, Exchange Server, SMTP
A question submitted on SearchExchange.com We took our exchange server down on Friday and since we brought it back up we have not received external emails. I can telnet to our ISP SMTP server OK from the exchange server itself but no mail is going out or coming in. No changes were made to the exchange server other than a symantec ghost copy was made and some exchange services were disabled and the server was re-started. I have ensured that all services are running OK. We have anti-spam software which I am sure is not intervening. I suspect its the cisco pix not allowing mail through.

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ASKED: April 17, 2008  3:33 PM
UPDATED: April 18, 2008  2:45 AM
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You have an Exchange Server, so I am not sure why you are testing telnet from the server to the ISP. Instead, you need to test telnet from the Internet to your server's external IP address, which may actually and most probably is an IP address on the Cisco PIX firewall. Since you mentioned taking the Exchange Server down, did you take the entire network down? What kind of Internet connection do you have, are you assigned a DHCP address, or do you have static IP addresses? Does the server itself use DHCP or is it assigned a static IP address? If you want further assistance, feel free to provide your domain name and I or someone in the community will be happy to check external accessibility for you.
Last Wiki Answer Submitted:  April 18, 2008  2:45 am  by  Wrobinson   5,610 pts.
All Answer Wiki Contributors:  Wrobinson   5,610 pts.
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We’ll likely need more information.

It may be a firewall issue… but you didn’t mention changes to the firewall. Did the IP address of the exchange server change during this timeframe?

The other thing that concerns me is: “some exchange services were disabled “, specifically what services and what exchange services are now running and not running?

What version of exchange are you running on?

You cay telnet to the ISP from exchange. Are you telneting on the standard telnet port or have you specified port 25 to do so?

Jerry Lees
 5,320 pts.