You must have misread the documentation.
An example of what headers look like taken directly from the documentation I linked you to is:
$headers = 'From:
[email protected]' . "\r\n" .
'Reply-To:
[email protected]' . "\r\n" .
'X-Mailer: PHP/' . phpversion();
Yours contain someones name, department, email and phone number all concatenated together in one continuous string that I imagine would look some thing like:
[email protected]
I would start by leaving the header argument out all together as not all servers are going to require it. Be aware though, that without valid headers, allot of mail will go to the trash.