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Exchange Server 2003

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by mdjbusmc

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I'm trying to configure my MS Exchange Server 2003 but have run into a problem. I'm able to send and receive mail internally without issue, however am only able to receive external mail, but not send. I have comcast as my current ISP, and have read some articles on port restrictions placed by comcast. I've tried changing port 25, to the reccomended alternate of port 587, however neither one seems to correct the problem. If anyone can offer any suggestions, it would be appreciated

5 replies

by churdoo

Comcast provides an SMTP server or smarthost that you can send (relay) email through. Since it is a relay, and since the email domain that you're sending as is likely not @comcast.net, there are settings you have to abide by and configure in exchange.

You have to configure exchange to send through smarthost, providing the DNS name of the comcast mail server; if that comcast server is using a port other than port 25, you have to configure the exchange outbound SMTP port accordingly; and finally, you probably have to enter your comcast credentials (email addy / password of the primary comcast account) in the Outbound Security tab of your SMTP server properties in exchange.

Other than this, you would have to use a third party SMTP relay service and you would have to configure exchange with all of the above settings corresponding to the third party service.

by dan.litteer

Since we do not host our own e-mail dns, I had to configure an SMTP virtual server with the IP address of our DNS at the ISP. Are you using the same?
Microsoft has a great tool called SMTPDiag. It runs from a command line, you enter your e-mail address (sender) and a recepient and you will see a sequence of each process.

by mdjbusmc

The utility works great, doesn't appear to be any problems internally within the organization, some mail messages are able to make there way externally, however mail to hotmail, yahoo, gmail, will not go though...
"Connecting to g.mx.mail.yahoo.com [209.191.88.239]
Error: Expected "220". Server is not accepting connections.
Failed to submit mail to g.mx.mail.yahoo.com"

I receive similar messages when attemping to send to hotmail, gmail

by dan.litteer

I get the same messages also. Other than the popular free sites, you had some that did go all the way through, using the utility, but can't from Outlook?

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