how to send multipart/alternative email with PHP correctly - php

Question

I'm trying to use the built-in PHP mail function to send multipart messages that contain a html and a plain text version of my message. I've been playing around with different encoding types but, I keep running into problems. Originally I set Content-Transfer-Encoding to Binary but, that resulted in exclamation points being placed every 78 characters. I also tried base64 but I believe that base64 is overkill for what I am doing.
All I'm doing is sending basic HTML, no encoded images, files, or attachments. I'd prefer an encoding method that would still allow the source code to be human readable.
I heard that Quoted-Printable is what I'm looking for but, when I attempted to send messages using that encoding type the result ending up looking really weird. I noticed a bunch of " symbols sprinkled throughout the message source code.
Here is the code I'm using:
$to = "to#test.com";
$subject = "test subject";
$boundary = uniqid('np');
$headers = "MIME-Version: 1.0\r\n";
$headers .= "From: from-address#test.com\r\n";
$headers .= "Reply-To: reply-address#test.com\r\n";
$headers .= "Return-Path: return-path#test.com\r\n";
$headers .= "Content-Type: multipart/alternative;boundary=" . $boundary . "\r\n";
$message = "This is a MIME encoded message.";
$message .= "\r\n\r\n--" . $boundary . "\r\n";
$message .= "Content-Type: text/plain; charset=UTF-8\r\n";
$message .= "Content-Transfer-Encoding: Quoted-Printable\r\n";
$message .= $plainTextMessage;
$message .= "\r\n\r\n--" . $boundary . "\r\n";
$message .= "Content-Type: text/html; charset=UTF-8\r\n";
$message .= "Content-Transfer-Encoding: Quoted-Printable\r\n";
$message .= $HTMLmessage;
$message .= "\r\n\r\n--" . $boundary . "--";
$ok = mail($to,$subject,$message,$headers);
What the heck am I doing wrong here?

Answer 1

Hi try the following code,
$to = "to#test.com";
$subject = "test subject";
$plainTextMessage = "Hi all";
$HTMLmessage = "<b>Hi all</b>";
//$boundary = uniqid('np');
$boundary = md5(uniqid(time()));
$headers .= "From: from-address#test.com\r\n";
$headers .= "Reply-To: reply-address#test.com\r\n";
$headers .= "Return-Path: return-path#test.com\r\n";
$headers .= "Content-Type: multipart/alternative;boundary=" . $boundary . "\r\n";
$message = "This is a MIME encoded message.";
$message .= "\r\n\r\n--" . $boundary . "\r\n";
$message .= "Content-Type: text/plain; charset=UTF-8\r\n";
$message .= "Content-Transfer-Encoding: Quoted-Printable\r\n";
$message .= $plainTextMessage;
$message .= "\r\n\r\n--" . $boundary . "\r\n";
$message .= "Content-Type: text/html; charset=UTF-8\r\n";
$message .= "Content-Transfer-Encoding: Quoted-Printable\r\n";
$message .= $HTMLmessage;
$message .= "\r\n\r\n--" . $boundary . "--";
$ok = mail($to,$subject,$message,$headers);
May it will help

Answer 2

No need for a third party library or an external mail forwarding host. This is what I use and it works like a charm. It also fixes some potential security holes by forcing headers using the $from address that can otherwise reveal your system user :
private function sendMail($to, $from, $fromName, $subject, $text, $html)
{
$boundary = uniqid('np');
$headers = "MIME-Version: 1.0\r\n";
$headers .= "From: ".$fromName." <".$from.">" . "\r\n";
$headers .= "X-Sender: ".$fromName." <".$from.">\n";
$headers .= "Return-Path: <".$from.">\n";
$headers .= "To: ".$to."\r\n";
$headers .= "Content-Type: multipart/alternative;boundary=" . $boundary . "\r\n";
// Content body
$message = "This is a MIME encoded message.";
$message .= "\r\n\r\n--" . $boundary . "\r\n";
$message .= "Content-type: text/plain;charset=utf-8\r\n\r\n";
// Plain text body
$message .= $text;
$message .= "\r\n\r\n--" . $boundary . "\r\n";
$message .= "Content-type: text/html;charset=utf-8\r\n\r\n";
// Html body
$message .= $html;
$message .= "\r\n\r\n--" . $boundary . "--";
// Send mail
mail('', $subject, $message, $headers, '-f ' . $from);
}