sender not specified

[Johan_Derks]

I have two simple home maid mailscripts in Esperanto:
One reads
$al = $retposhto;
$temo = "Re: komento pri esplorpaĝoj pri 15a regulo";
$teksto = "bla bla";
$From = "[email protected]";
$CC = "[email protected]";
$headers = "From: ".$From."\r\nCC: ".$CC;
The variables go into mail($al, $temo, $teksto, $headers);

I ([email protected]) should receive the message, as I am mentioned in $CC,
and I do, but with "sender not specified". Also the message ($teksto) is empty.

The other one reads
$al = "[email protected]";
$temo = "komento pri esplorpaĝoj pri 15a regulo";
$teksto = $komentoj."\r\n".$krozilinform."\r\n".$uzanto;
$headers = "From: ".$retposhto;
The variables go into mail($al, $temo, $teksto, $headers);

Now I should receive the mail as addressee. The effect is the same as with the first script.

Can anyone help me?