Not receiving mail on gmail?

Question

gmail

If you send a letter from my [email protected] mailbox directly to gmail, it will come. And if through the verification script, then it gets into spam:

<?
  ini_set( 'display_errors', 1 );
  error_reporting(E_ALL & ~(E_NOTICE | E_STRICT));
  $from = "[email protected]";
  $to = "mррмр@gmail.com"; //сюда вписать ящик, на который нужно отправить письмо
  $subject = "PHP Mail Test script";
  $message = "This is a test to check the PHP Mail functionality";
  $headers = "From:" . $from;
  if (mail($to,$subject,$message, $headers))
     echo "Test email sent";
  if (mail($to,$subject,$message, $headers, 'f'.$from))
     echo "Test email sent with extraParams";
?>

Answer 1

In my case, it was necessary to register the domain in \etc\postfix\main.cf and everything worked, the postfix mail server was installed.

Answer 2

Obviously, because you send "directly" by logging in to Google's SMTP, and from a script - from your server, probably also SPF / DKIM / reverse zone is not configured.

Answer 3

https://www.mail-tester.com/