Sending SMTP Email to Exchange using Telnet

Open your telnet client and connect to your Exchange server on port 25

Microsoft Telnet> open exchange.mydomain.local 25 

And you’ll see a response like this;

220 exchange.mydomain.local Microsoft ESMTP MAIL Service, Version: 6.0.3790.3959 ready at Thu, 20 Aug 2009 12:03:39 +0100

Type the HELO (or EHLO) command;

250 exchange.mydomain.local Hello []

Now to begin your message, enter who the message is from;

mail from:phil.harding@mydomain.local
250 2.1.0 phil.harding@mydomain.local....Sender OK

Enter the message recipient;

250 2.1.5

Now for the subject and message part of the message;

354 Start mail input; end with .
subject:This is a test
Hello from me to you
This is a line
250 2.6.0 <EXCHANGEWtIIZS2TRqf0000000a@exchange.mydomain.local%gt; Queued mail for delivery

The last line displayed confirms that your message has been received by the SMTP server and is queued for delivery.

See this post for more information on Exchange HELO/EHLO commands.

Published by

Phil Harding

SharePoint Consultant, Developer, Father, Husband and Climber.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.