<div>
Yes, through Outlook.<br />
<br />
We are sending to an outside domain. &nbsp;We have no problems with any domains, except on particular one.
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Yes, through Outlook.

We are sending to an outside domain.  We have no problems with any domains, except on particular one.

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<div class="content wysiwyg-content">
I'm getting the following message when I try emailing one particular domain:<br />
<br />
550 relay not permitted<br />
<br />
I'm using Symantec Mail Security for MS Exchange 6.5 and Windows Small Business Server 2003.<br />
<br />
Is this coming from SMSME or Exchange?<br />
<br />
Thank you!
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I'm getting the following message when I try emailing one particular domain:

550 relay not permitted

I'm using Symantec Mail Security for MS Exchange 6.5 and Windows Small Business Server 2003.

Is this coming from SMSME or Exchange?

Thank you!

Relay not permitted

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

Various techniques are used to prevent email spam (unsolicited bulk email). No technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate email (false positives) vs. not rejecting all spam (false negatives) - and the associated costs in time and effort. Anti-spam techniques can be broken into four broad categories: those that require actions by individuals, those that can be automated by email administrators, those that can be automated by email senders and those employed by researchers and law enforcement officials.