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Maybe someone could explain how to use Telnet to test Virtual SMTP Server on another machine with Windows 2008?

I have tried command below and get unrecognized command error. (The actual server deomain replaced with xxxxx)

Telnet 25
220 Microsoft ESMTP MAIL Service, Version: 7.0.6002.18222 rea
dy at  Tue, 23 Oct 2012 15:57:18 +0300
500 5.3.3 Unrecognized command
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1 Answer 1

up vote 5 down vote accepted

Your syntex needs to start with helo Example below. Make sure to use enter spaces correct and the period at the end.

    telnet 25
    mail from: 

    Subject:This is a test



If your lazy just use

Assuming its a external server.

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