What is adding "X-PHP-Originating-Id" to my email header?

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I have a php script that emails form data to me from a hosted provider domain. I do not have access to the php.ini file.

This script was working fine until about a week ago when emails stopped getting sent - no errors on the script, just the emails didn't leave the email server.

The hosting provider claims that it was because of the attribute: "X-PHP-Originating-Id" on my emails tripping the spam filter.

The attribute does appear, but from the code I use to send the email:

$headers = "From: notspam@foo.com\r\n".
           'Reply-To: '.$email_from."\r\n" .
           'X-Mailer: PHP/' . phpversion() . "\r\n".
           'Return-Path: admin@foo.com';

$additional = "-radmin@foo.com";
$retMail = @mail($email_to, $email_subject, $email_message, $headers, $additional); 
if (!$retMail)
{
    $error = htmlspecialchars($php_errormsg);
}
else
{
    $error = "";
}

I'm not putting that attribute on the header.

I found a number of examples of "spamwatch" emails on the web with the attribute in the header, but I've found no documentation on it specifically (I know about "X-PHP-Originating-Script" - is this a precursor?).

Frankly, I think the hosting site is pointing at a red herring but I wanted to get some groupthink on it.

Thanks in advance!

asked 43 secs ago

Eli

560