In PHP mail() function allows you to send emails directly from a script. The given mail function is contain errors.mail(to,subject,message); code example
Example: php mail function
<?php
$to = "[email protected]";
$from = $_POST['email'];
$name = $_POST['name'];
$subject = $_POST['subject'];
$number = $_POST['number'];
$cmessage = $_POST['message'];
$headers = "From: $from";
$headers = "From: " . $from . "\r\n";
$headers .= "Reply-To: ". $from . "\r\n";
$headers .= "MIME-Version: 1.0\r\n";
$headers .= "Content-Type: text/html; charset=ISO-8859-1\r\n";
$subject = "You have a message from your Bitmap Photography.";
$logo = 'img/logo.png';
$link = '#';
$body = "<!DOCTYPE html><html lang='en'><head><meta charset='UTF-8'><title>Express Mail</title></head><body>";
$body .= "<table style='width: 100%;'>";
$body .= "<thead style='text-align: center;'><tr><td style='border:none;' colspan='2'>";
$body .= "<a href='{$link}'><img src='{$logo}' alt=''></a><br><br>";
$body .= "</td></tr></thead><tbody><tr>";
$body .= "<td style='border:none;'><strong>Name:</strong> {$name}</td>";
$body .= "<td style='border:none;'><strong>Email:</strong> {$from}</td>";
$body .= "</tr>";
$body .= "<tr><td style='border:none;'><strong>Subject:</strong> {$csubject}</td></tr>";
$body .= "<tr><td></td></tr>";
$body .= "<tr><td colspan='2' style='border:none;'>{$cmessage}</td></tr>";
$body .= "</tbody></table>";
$body .= "</body></html>";
$send = mail($to, $subject, $body, $headers);
?>