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There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.<br />
&lt;SOMA.no #5.5.0 smtp;550 You are not SOMA.no&gt;<br />
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I get this when I try to send to a specific email address. When I send it from a different email it gets trough. <br />
I use exchange 2003. any ideas? 
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There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<SOMA.no #5.5.0 smtp;550 You are not SOMA.no>

I get this when I try to send to a specific email address. When I send it from a different email it gets trough. 
I use exchange 2003. any ideas? 

There was a SMTP communication problem with the recipient's email 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.