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Webcc, when you say &quot;outgoing settings (SMTP)w/authentication&quot; I hope you're not referring to Outbound Security for SMTP because this should be set to Anonymous access so mail flow outbound can be sent from the Exchange 2003 server.<br />
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I would also check your firewall to make sure you have no ACLs blocking outbound SMTP traffic on port 25. &nbsp;Make sure the public IP address the Exchange 2003 server uses to send outbound messages is not on any blacklists as well.
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Webcc, when you say "outgoing settings (SMTP)w/authentication" I hope you're not referring to Outbound Security for SMTP because this should be set to Anonymous access so mail flow outbound can be sent from the Exchange 2003 server.

I would also check your firewall to make sure you have no ACLs blocking outbound SMTP traffic on port 25.  Make sure the public IP address the Exchange 2003 server uses to send outbound messages is not on any blacklists as well.

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Migrated Exchange 2003 to a new server internal email is working fine. &nbsp;Utilizing POP for outside reps. &nbsp;Incoming emails are working but can't get outgoing to work when using our server as the outgoing settings (SMTP)w/authentication to use same as incoming. Login prompt keeps popping up to login again. When I setup one of the laptops at home to use comcast's smtp emails transmit fine.
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Migrated Exchange 2003 to a new server internal email is working fine.  Utilizing POP for outside reps.  Incoming emails are working but can't get outgoing to work when using our server as the outgoing settings (SMTP)w/authentication to use same as incoming. Login prompt keeps popping up to login again. When I setup one of the laptops at home to use comcast's smtp emails transmit fine.

Cannot use server's SMTP for outgoing

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

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.