To test an SMTP server is running (Basic test)

Open a command prompt

telnet servername 25 (where servername is the hostname or ip address)
ehlo domainname (look in Active Directory if you don’t know the domain name)
mail from:administrator@domainname
rcpt to:auser@domainname
DATA
Subject:Test
(blank line)
This is a test message
. (note you have to put a dot in)
(blank line)
QUIT

Taken from this article: http://support.microsoft.com/default.aspx?kbid=153119

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