Allowing application servers to relay off Exchange Server 2007

Allowing application servers to relay off Exchange Server 2007.

You want to allow some application such as SQL Server reporting or agent to send emails to external persons, however Exchange 2007 does not allow the mail out and you get an error in the logs like this:
SMTP error message “550 5.7.1 Unable to relay”

To allow mail through you need to do some further configuration and run a PowerShell script, this webpage provides a great explanation and instructions on exactly what you need to do:
http://msexchangeteam.com/archive/2006/12/28/432013.aspx

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