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1&amp;1 requires authentication for SMTP access. &nbsp;Where do I set that up?
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1&1 requires authentication for SMTP access.  Where do I set that up?

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I cannot send email messages to my client who has a prodigy.net address. &nbsp;I get the following message after sending the email: &nbsp;Your message did not reach some or all of the intended recipients.<br />
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&nbsp; &nbsp; &nbsp; Subject: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Test Message<br />
&nbsp; &nbsp; &nbsp; Sent: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6/23/2008 2:39 PM<br />
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The following recipient(s) could not be reached:<br />
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&nbsp; &nbsp; &nbsp; Tony Miranda on 6/23/2008 2:38 PM<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; The message cannot be delivered due to a configuration error on the server. Please contact your Administrator.<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;graystone.pro #5.3.0 smtp;553 5.3.0 flpi132 - m5NJbuog007705, DNSBL:521&lt; 68.16.219.193 &gt;_is_blocked.__For_informa<wbr />tion_see_<a href="http://att.net/blocks" rel="ugc">http://att.net/blocks</a>&gt;<wbr /><br />
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I am using Outlook 2003 and Microsoft Small Business Server 2003. &nbsp;My ISP is ATT. &nbsp;Our domain graystone.pro is hosted by 1&amp;1. &nbsp;I connect to the POP3 accounts there and route them through Exchange. &nbsp;I am using the default SMTP server configuration in Exchange. &nbsp;How to I set up a SMTP Connector to 1&amp;1's SMTP server?
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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?

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

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).