Test your SMTP server using Windows Telnet Feature

Last updated on March 30th, 2023 at 05:07 pm

If you want to test your SMTP server is working correctly, you can use the telnet feature within Windows. The following guide will walk you through the steps to carry this out.

Telnet to test your SMTP server

Just open up an elevated command prompt then enter these commands in turn:

telnet yourmaildomainname 25

This should then connect to your domain and you will see a message like this:

Then run this command:

helo techygeekshome.info

This should then give you a 250 response:

Then run this command for your sender address:

mail from: send@techygeekshome.info

This should give you a 250 OK response:

Then run this command for the recipiant of the email:

rcpt to: receive@techygeekshome.info

Then type data and hit the Enter key. If this has worked, you should get a response with a 250 2.6.0 in there and an email address.

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