Email - How to test if your server email configuration was done correctly ?

About

This article will show different server configuration testing in order to validate your email server configuration.

In our case, we had installed Postfix

Technics

Sending an email to Provider

Testing an email configuration is done by sending an email to a provider that will:

  • show you if you pass the tests
  • eventually score your email.

Mail Tester

The most easy way is to send an email at mail-tester

Opendkim Test Mailer

Gmail

Send an email and check the original email, Gmail will show you if you have passed the test:

Gmail Original Message Dkim Test

Testing locally with netcat

Network - netcat (nc, ncat) 

 nc mail.example.com 25 
 EHLO $hostname 
 250-server01.bytle.net 250-PIPELINING 250-SIZE 10240000 250-VRFY 250-ETRN 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN  
 MAIL FROM:<[email protected]> RCPT TO:<[email protected]> DATA Subject: Test email Body of the email . QUIT




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