//activation link
$activation_link = "http://www.civ-online.com/signedup.php?link=$form_username_hashed";

$mime_boundary = "Civ-Online.com".md5(time());
//------------------------------------msg body---------------------------------
$subject = "Civ-Online Confirmation Email";

$headers = "From: Civ-Online.com <team@civ-online.com>\r\n";
$headers .= "Reply-To: Civ-Online.com <team@civ-online.com>\r\n";
$headers .= "MIME-Version: 1.0\r\n";
$headers .= "Content-Type: multipart/alternative; boundary=\"$mime_boundary\"\r\n";

$message = "--$mime_boundary\r\n";
$message .= "Content-Type: text/plain; charset=UTF-8\r\n";
$message .= "Content-Transfer-Encoding: 8bit\r\n\r\n";
$message .= "Dear user,\r\n\r\n";
$message .= "On behalf of the team here at Civ-Online.com we thank you for signing up and joining us.\r\n";
$message .= "Below is the activation link required to activate your account.\r\n\r\n";
$message .= "Simply click it and it will take you to the site\r\n\r\n";
$message .= "$activation_link\r\n\r\n";
$message .= "--$mime_boundary--\r\n\r\n";
//-------------------------------end of msg body
//---------------------------sending function
$mail_sent = @mail( $form_email_address, $subject, $message, $headers );
echo $mail_sent ? "Mail sent" : "Mail failed";