How do I prevent ATT from blocking email from my Microsft Exchange Server?

It appears your server may be on ATT's blocked domain list.

Go here and fill out this form to get it removed: http://worldnet.att.net/general-info/bls_info/block_admin.html

It usually takes a couple of days.

I filled out that form last week, but still have the issue.  I didn't know what to fill in for "What changes have you made to your configuration since you have been blocked."  I don't know what changes to make.

Did they send you a reply?

Usually you get added if spam or spam like behavior is coming from your server, so they want to know what you did to remedy the problem. However, they also add servers erroneously too, just make sure SMTP isnt coming from your network except from the mail server itself.

They have not responded.  How do I "make sure SMTP isnt coming from your network except from the mail server itself?"

> make sure SMTP isnt coming from your network except from the mail server itself?

You'd normally lock down Outbound SMTP requests (Port 25, TCP) on your Firewall so they could only come from servers you authorise.

You should check a few other things as well:

1. What name does your server use to create SMTP Connections?

You can find that under Exchange System Manager \ Administrative Groups \ Your Administrative Group \ Servers \ GEServer \ Protocols \ SMTP. Open up the Properties for the Virtual SMTP Server, select Advanced then Delivery (if I remember correctly) and check the FQDN specified there.

The name used should be public and match the Reverse Lookup Record in place for your server.

2. Check the Reverse Lookup Record

When your server sends out it will do so from a specific IP Address. That can be the IP Address of your Firewall, or another Public IP if you use NAT.

That IP Address should have a Reverse Lookup (Pointer / PTR) Record configured so that the IP maps back to the name of your mail server.

Missing Reverse Lookup is, by far, the most common reason for message rejections.

HTH

Chris

Chris,

Thanks for the help.  You said, "That IP Address should have a Reverse Lookup (Pointer / PTR) Record configured so that the IP maps back to the name of your mail server."  How do I check this?  I'm sending screen shots of my SMTP configuration.
GESERVER-Advanced-Delivery.bmp
GESERVER-Configure-External-DNS-.bmp
GESERVER-Default-SMPT-VIrtual-Se.bmp
GESERVER-SMTP-Domain-Name-Check.bmp

Thanks for the help.  I contacted my domain host, 1&1, and found out that I need a dedicated server package to do this.    We currently have a shared server package.  I've been thinking about ditching Exchange for some time now.  We only have 3 employees and Exchange has been a hassle all along.  I like the shared folders and contacts, but don't think it's worth it anymore especially if we're going to get our email blocked!

If  create an SMTP connector to my domain host, will this solve my problem?

Potentially, yes. If they have an SMTP service you can relay though it would get around the need for local configuration.

Chris