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

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< 68.16.219.193 >_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?
graystoneengineeringAsked:
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ormerodrutterConnect With a Mentor Commented:
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.
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graystoneengineeringAuthor Commented:
1&1 requires authentication for SMTP access.  Where do I set that up?
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