How do I Setup a SMTP Connector to prevent ATT from blocking email from my Microsft Exchange Server?

Posted on 2008-06-25
Medium Priority
Last Modified: 2012-08-13
I cannot send email messages to my client who has a prodigy.net address.  I get the following message after sending the email:  Your message did not reach some or all of the intended recipients.

      Subject:      Test Message
      Sent:      6/23/2008 2:39 PM

The following recipient(s) could not be reached:

      Tony Miranda on 6/23/2008 2:38 PM
            The message cannot be delivered due to a configuration error on the server. Please contact your Administrator.
            <graystone.pro #5.3.0 smtp;553 5.3.0 flpi132 - m5NJbuog007705, DNSBL:521< >_is_blocked.__For_information_see_http://att.net/blocks>

I am using Outlook 2003 and Microsoft Small Business Server 2003.  My ISP is ATT.  Our domain graystone.pro is hosted by 1&1.  I connect to the POP3 accounts there and route them through Exchange.  I am using the default SMTP server configuration in Exchange.  How to I set up a SMTP Connector to 1&1's SMTP server?
Question by:graystoneengineering
LVL 23

Accepted Solution

ormerodrutter earned 1500 total points
ID: 21867469
In ESM expand Administrative Group and Connectors, right click SMTP connector and choose Properties.
Select "Forward all mail through...." and enter your ISPs SMTP server in the box. OK to save and that's it.

You need to find out why your IP is blocked, usually caused by sending out lots of spams so you need to locate the client machine which does that. A good start would be by blocking port25 on your firewall (router) for client PCs except your server so no one else is sending email directly to the outside world (they will use exchange). Run full AV scan on all machines to fix the problem and get yourself delisted.

Author Comment

ID: 21868381
1&1 requires authentication for SMTP access.  Where do I set that up?

Featured Post

Has Powershell sent you back into the Stone Age?

If managing Active Directory using Windows Powershell® is making you feel like you stepped back in time, you are not alone.  For nearly 20 years, AD admins around the world have used one tool for day-to-day AD management: Hyena. Discover why.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Are you in the migration process of your Exchange to Exchange Online? Be aware of customized solutions developed on the transport role on your old Exchange server. They might not be convertible to Exchange Online!
After a recent Outlook migration from a 2007 to 2010 environment, some issues with Distribution List owners were realized. In this article, I explain how that was rectified.
In this Micro Video tutorial you will learn the basics about Database Availability Groups and How to configure one using a live Exchange Server Environment. The video tutorial explains the basics of the Exchange server Database Availability grou…
To export Lotus Notes to Outlook PST or Exchange and Domino Server files to Exchange Server or PST files with ease, go for Kernel for Lotus Notes to Outlook conversion tool. Through the video, you can watch the conversion process. A common user with…

621 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question