// sendmail and mail() extract Cc from the header before sending
if((($this->Mailer == "sendmail") || ($this->Mailer == "mail")) && (count($this->cc) > 0))
$result .= $this->AddrAppend("Cc", $this->cc);
eForm &cc parameter seems to be broken but actually it isn’t.
You probably meant &ccsender parameter?
Must be specific for your platform, here it works fine without this fix...
No, I mean &cc parameter bug discussed in these topics: