A simple node smtp script to check the connectivity to the MTA

Support DKIM.

Require Node 15+

How to use

• copy the .env-sample as .env => $ cp .env-sample .env
• fill the environment variables. Concatenate the DKIM private key to 1 line string with \n
• run the script => $ node index.js

Tip If you sent the email to the check-auth@verifier.port25.com you will get back very powerful report.