Email address to send a read receipt to.
Object Oriented Interface
public function getReadReceiptTo(); public function setReadReceiptTo($value);
ipworkssmime_sfilemailer_get($res, 42 ); ipworkssmime_sfilemailer_set($res, 42, $value );
When this property is set, a Disposition-Notification-To header is added to the message. This property should be set to an email address which should receive the read-receipt.