code: public function setFrom($mail = '', $name = null, $reply = true)
      {
          $mail = trim($mail);
          if (strlen($mail) && Helper::isEmail($mail)) {
              $this->from = !empty($name) ? array($name=>$mail) : array($mail);
              $this->getMailer()->setRegistry('Return-Path', '<'.$mail.'>', 'headers');
              $this->getMailer()->setRegistry('X-Sender', $mail, 'headers');
              if ($reply) {
                  $this->setReplyTo($mail, $name);
              }
          }
          return $this;
      }
docs: Set From field
  
  @param string/array $mail The email address to add, or an array of name=>email pairs
  @param string/bool $name The name to show for the email address if there is just one
  @param bool $reply Set the "reply-to" to the same address ? (default is TRUE)
  @return self
  @see \MimeMailer\MimeEmail::checkPeopleArgs