What happens when we use mail () in PHP?

Question

<?php
mail("[e-mail]", "My Subject", "Line 1\nLine 2\nLine 3");
?> 

We do not need to specify email/password/mail server address && port, but it can be sent.

Answer 1

This is because the email address / port / password / mail server is defined in your PHP.ini file.

Answer 2

On * nix sendmail(8)is invoked.

Answer 3

I believe that he was kept at php.ini.

Answer 4

PHP mail()does not support SMTP authentication. If you need SMTP authentication, http://pear.php.net/package/Mail