What's wrong with this mail code?

Can receive this on some addresses but not others.

[HughMungus]

$mailto = $email;
$xHeaders = "From: [e-mail]";
$subject="Subject";
$text = "Some message.";
mail($mailto, $subject, $text, $xHeaders);

I can get this email to one of my mailboxes but not another (strangely, the email address of the host from which I'm sending it). Do I need separate headers for the "to" and "from" or something?

[waldemar]

There is several issues about PHP's mail command, best recommendation is the lecture of the user comments on the mail command at php dot net. For example, one guy was more lucky moving the recipients into the header...