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Our local users are having trouble sending to specific email addresses with the following error message:<br />
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&quot;Your message did not reach some or all of the intended recipients.<br />
<br />
&nbsp; &nbsp; &nbsp; Subject: &nbsp;RE: SUBJECT<br />
<br />
&nbsp; &nbsp; &nbsp; Sent: &nbsp; &nbsp; 8/1/2007 10:02 AM<br />
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The following recipient(s) could not be reached:<br />
<br />
&nbsp; &nbsp; &nbsp; 'user@user.com' on 8/1/2007 10:03 AM<br />
<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; There was a SMTP communication problem with the recipient's email server. &nbsp;Please contact your system administrator.<br />
<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;domain.com #5.5.0 smtp;550 access denied R&gt;&quot;<br />
<br />
Any ideas what this access denied refers too?
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Our local users are having trouble sending to specific email addresses with the following error message:

"Your message did not reach some or all of the intended recipients.

      Subject:  RE: SUBJECT

      Sent:     8/1/2007 10:02 AM

The following recipient(s) could not be reached:

      'user@user.com' on 8/1/2007 10:03 AM

            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.

            <domain.com #5.5.0 smtp;550 access denied R>"

Any ideas what this access denied refers too?

Exchange #5.5.0 access denied

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).

Windows Server 2003

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.