SMTP 25 blocked externally

Posted by Jeff on Server Fault See other posts from Server Fault or by Jeff
Published on 2011-01-08T16:02:39Z Indexed on 2011/01/08 16:55 UTC
Read the original article Hit count: 164

Filed under:

windows-server-2008

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networking

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smtp

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exchange-2007

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emailserver

not sure how to title this question...

we run an exchange server with around 80 internal users, all outgoing mail is relayed off a smart host (ISP smtp server) so nothing is actually sent to the world via our server. i wanted to check the server, locally i can telnet to port 25 with no issues and receive the esmtp service ready reply. whenever i do it from an external address (off our local network) i receive unable to connect error 10060.

can this cause problems with SPF records, and reverse DNS ? should my exchange server be able to accept smtp requests, requiring authentication before i am able to send from external addresses? if so how...

also the exchange server is behind a NAT (asa) device, more than likely thinking that the nat is not configured to route the smtp 25 request to the exchange server..

thanks

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