mail() duplicating emails

[F_SH]

Hey

I've got a nice email sending script that works a charm - except any email sent is sent twice, despite there only being a single call to the mail() function. It's a simple script, no loops that could have cause it to be called twice. Infact, it's a problem I'm having on two different scripts.

Is there some horrible secret about mail() I should be aware of? Or does my server have a double-email complex?

The actual code is:

$recipient = '[e-mail]';

$message = 'A message.';
$message = wordwrap($message, 70);

// Define Header
$headers .= 'To: My Dear Friend <'. $recipient .'>' . "\r\n";
$headers .= 'From: My Dear Self <NOREPLY>' . "\r\n";

// Send
mail($recipient, $subject, $message, $headers);

(OK, so it's not the actual code, but for all intents and purposes it is)

[kburger]

Leave out the 'To:' line in the additional headers. You've already specified where it's to go.

$headers .= 'To: My Dear Friend <'. $recipient .'>' . "\r\n";