Using PHP script to send HTML email messages, but they don't work in Gmail?

Question

I hope someone can offer some help here. I recently started sending out my news letter in HTML format with a PHP script, but my subscribers with Gmail addresses are just seeing the HTML code. Can anyone offer any help here?

Here's is the part of my headers for the encoding.

***********************
$headers = 'MIME-Version: 1.0' . "\r\n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
***********************

The message looks just fine in Yahoo mail and through three different pop accounts that I use.

Answer 1

For all gmail email addresses, use \n only instead of \r\n as separator.