Oct 31, 2017

Perform an Automated Test for Open Relays

  1. Go to http://mxtoolbox.com/diagnostic.aspx.
  2. In the Mail Server field, enter your server's IP address.
  3. Click Test Email Server.
On the page that displays, receiving a message of Failed To Connect in the Resultscolumn of the SMTP Connect row means your relays are closed.
If you receive any other outputs, your relays are open.