strange mail() header behaviour

[digitalecartoon]

I've noticed that when I use a mail.nl in a mailscript header like this:

$headers = "From: [e-mail];
mail($to, $subject, $message, $headers);

I do receive the mail but with the domain of my hosting provider attached like this in the From field:

[e-mail]

This only happens with mail.nl. Is this some kind of special setting the header function uses? Or a bug? [e-mail] works fine...

[weekender]

headers should end with a line break

$headers = "From: [e-mail]\r\n";

Maybe that'll fix it?