Not receiving emails from php mail() function

I’m not receiving emails from mail() function.

I created a php test:

    ini_set( 'display_errors', 1 );
    error_reporting( E_ALL );
    $from = "";
    $to = "";
    $subject = "PHP Mail Test script";
    $message = "This is a test to check the PHP Mail functionality";
    $headers = "From:" . $from;
$headers .= "Reply-To: $to";

The output is…


I’m using a LEMP droplet on Ubuntu 16.06. I already installed postfix, opened port 25 and checked my host file… localhost.crazytraction localhost amsterdam

which I think is correct (amsterdam is the hostname)

I can receive the email in one of my accounts, but I tried other 3 and none of them received the email, even Gmail is not receiving it.

What Am I doing wrong?

Btw, I tested to send an email using the same function on another droplet and it worked, so it has to be something with the environment, but I cannot figure what it is!

Thank you.


Submit an answer
You can type!ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!

These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.

Your SPF record is invalid and you are not sending all the required headers an e-mail should have.