Following example uses PHP builtin function mail(). Function gets three parameter. Target email, subject and message. Default type is text. But you can enter custom headers: From, Cc, and Bcc. Multiple extra headers should be separated with a CRLF (\r\n). 

Mail function returns a boolean value.

 Syntax:

bool mail ( string $to , string $subject , string $message [, string $additional_headers [, string $additional_parameters ]] )

<?php
// email address
$email = "info@dotnetindex.com";

// The email subject
$subject = "Enter your subject here";
// The message body (TEXT)
$message = "Enter your message here";
mail($email, $subject, $message, "From: $email");
echo "The email has been sent.";
?>

 With additional headers:

You can get more information at this page.