Start a terminal then at your command prompt:

?> telnet yourmailserver 25

You should get back the servers banner greeting.

?>  220 71.5.2.197.ptr.us.xo.net ESMTP

Then you say hello!

?>  helo foo

Then it should say

?>  250 71.5.2.197.ptr.us.xo.net

Then you should tell it who is sending the email

?>  mail from: isurge3@yahoo.com

Then it will say ok .. 

?>  250 ok

Then you need to tell it who the email is for(your test account)

?>  rcpt to: yourtestaccount@onthatserverorcluster.com

Then tell it should tell you ok if that   

?>  250 ok

Then start to send the email

?>  data

You should get back something like

?> 354 go ahead punk, make my day

Then send some email foo...

?> from: jimmy@dwalliance.com
subject: test
date: today
asdf
ads
.

You should get back:

?>  250 ok

then type

?> quit

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