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windows server 2003 e-mail issues...not able to send/receive outside domain

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by mhines

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Hello.

We are in desperate need of help. We are running a server with Windows Server 2003 on it. We are trying to setup the e-mail portion of the server and are having troubles. Our domain is tandmcomputers.ca. We are able to send to accounts within that domain BUT when I use another e-mail address (hotamil, ISP's e-mail, etc) and try to send to "example@tandmcomputers.ca" we cannot receive it. We get a bouncback message from the e-mail provider we are sending from. Also we cannot send from "example@tandmcomputers.ca" to other e-mail address (hotmail, ISP's e-mail, etc).

Any help or suggestions will be grately appreciated.

5 replies

by bracinowski

Are you using an Exchange Server and if so, is you MX record being hosted by an ISP (you may need to contact them about this)? If it is an Exchange Server, you may have your email accounts (through a Group Policy or Active Directory) restricted to your domain only. In Active Directory, right click on a user and go to "properties" and look for a tab labeled "Exchange General". Click on that tab and you should see a button labeled "Delivery Restrictions" and in there see if the "From authenticated users only" is checked. This could be were you are filtering to send and receive only from the users within your domain.

by mhines

I am not running Exchange for my e-mail server. I am using the POP3 and SMTP server that came built in with Windows Server 2003.

My ISP is not controlling my MX records. That is done locally on this server.

by cg it

your domain name registar name servers must resolve your domain name to your public IP address and also provide MX record resolution to your domain name. Verify that your domain name registar authoritative name servers for your domain name provide this.

you shouldn't have any problems sending email out though hotmail tends to be picky about receiving mail from mail servers that don't have reverse lookup in DNS. Try Yahoo.

If you still can't send emails out, then it's possible that your perimeter firewalls are blocking port 25 outbound traffic.

It's also possible that your ISP blocks port 25 traffic. You can call them and find out. If they do, they should provide you with the steps to reconfigure your servers to send mail out on a different port.

by mhines

My domain name registrar is resolving my domain name to my public IP address and they are resolving MX records. So that seems to be fine.

In our DNS we do have reverse lookup setup so I don't think that is causing a problem with hotmail not sending to my domain or my domain not sending to hotmail. We also tried yahoo as per your suggestion and it's the same thing.

I know for a fact that my ISP is blocking port 25 (I work for them) but we switched it to port 587 which should be allowing the traffic to flow through. Also, our firewalls are open on port 587.

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