Unable to send message (503 5.5.2 Sender already specified)

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	Unable to send message (503 5.5.2 Sender already specified)

Solution 1. Drop to a command prompt.

2. Telnet to your server on port 25.

3. Most likely the Microsoft SMTP Service is running. For example, the header will look similar to this:
220 mst.smartmax.com Microsoft ESMTP MAIL Service, Version: 6.0.2600.1106 ready

4. Go to your Services Control Panel and STOP the Simple Mail Transfer Protocol (SMTP) Service. We recommend that you set this Service to manual or disabled.

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02 Jun 2006 01:02 PM