76     protected $header = array();  variable in Tx\\Mailer\\Message
305         $this->header['Date'] = date('r');
318         $this->header['Return-Path'] = $fromEmail;
319         $this->header['From'] = $fromName . "<" . $fromEmail .">";
321         $this->header['To'] = '';
326             $this->header['To'] .= $toName . "<" . $toEmail . ">, ";
328         $this->header['To'] = substr($this->header['To'], 0, -2);
329         $this->header['Cc'] = '';
334             $this->header['Cc'] .= $toName . "<" . $toEmail . ">, ";
336         $this->header['Cc'] = substr($this->header['Cc'], 0, -2);
337         $this->header['Bcc'] = '';
342             $this->header['Bcc'] .= $toName . "<" . $toEmail . ">, ";
344         $this->header['Bcc'] = substr($this->header['Bcc'], 0, -2);
351             $this->header['Reply-To'] = $replyToName . "<" . $this->replyToEmail . ">";
359         $this->header['Subject'] = $subject;
361         $this->header['Message-ID'] = '<' . md5(uniqid()) . $this->fromEmail . '>';
362         $this->header['X-Priority'] = '3';
363         $this->header['X-Mailer'] = 'Mailer (https://github.com/txthinking/Mailer)';