public function setSender($senderEmail, $senderName=null, $allowReply=true) {
		//=?utf-8?b?".base64_encode($from_name)."?= <".$from_a.">\r\n
		$this->setHeader('From', $senderName===NULL ? $senderEmail : static::escapeB64($senderName).' <'.$senderEmail.'>');
		$this->setHeader('Sender', $senderEmail);
		if( $allowReply && empty($this->headers['Return-Path']) ) {
			$this->setReplyTo($senderEmail);
		}
	}