There’s many times when I want to send an email for testing using postfix and I can never remember how to do it. Here is how.This is super useful to make sure your SMTP relay thru AWS/Postmark is working as it should. Then you can tail /var/log/mail.log to see if it worked or if it got rejected for whatever reason.

First type the following to start sendmail


Now we can type in or paste the following

Subject: Test Send Mail
Hello World

To end the input and start the send hit ctrl+D