exclamation mark (!) showing up in emails from PHP mail() function

I ran into this problem and this is the solution that worked for me. This post helped out http://us2.php.net/manual/en/ref.mail.php#53231


It references RFC 2822, and look at section 2.1.1. "Line Length Limits" for the explanation of the 998 char limit. Anyway the solution at php.net worked for me minus the rtrim.

The php code for mine is
$message = chunk_split(base64_encode($message));

Then also you must make sure the headers are using base64 for the Content-Transfer-Encoding:
$header .= "Content-Transfer-Encoding: base64\r\n\r\n";

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