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helo and ehlo

Posted on 2010-08-31
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Last Modified: 2013-11-30
Please assist me with the laymans understanding and use of helo and ehlo from the cmd prompt in relation with port 25 and SMTP.

How do I use the above commands to troubleshoot port 25 and SMTP in a Exchange 2003 environment?

Thanks

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Question by:lazik
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shalabhsharma earned 2000 total points
ID: 33567784
EHLO is the Enhanced SMTP (ESMTP) version of HELO. ESMTP adds a number of essential additions to the SMTP protocol. When this command is sent, the server will respond with the EHLO options that is supports.

 If you use ESMTP with EHLO and a server only supports SMTP (HELO) then your sending server
will fall back to HELO so ESMTP should work with older servers as it will fall back to HELO if needs be.

SMTP (HELO) is the old basic text based version whereas ESMTP (EHLO) will support graphic rich emails etc.  

I believe pretty much every server supports HELO so you would be fine using it i guess, but would be disadvantaging yourself if you were intending to send rich
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by:shalabhsharma
ID: 33567827
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by:Barry Gill
ID: 33569070
you wouldn't necessarily use these commands to troubleshoot a connection to Exchange 2003.
Basically if you chose helo or ehlo you would already be connected to Exchange so should be looking elsewhere for your trouble.

What exactly is the issue you are trying to troubleshoot?
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Author Comment

by:lazik
ID: 33573037
Looking for the commands you would use to troubleshoot issues from the cmd prompt and some basic layman terms on what on how helo and ehlo work.
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Author Closing Comment

by:lazik
ID: 33593317
Thanks much.
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