MDNTo Property
The system to which an MDN should be directed.
Syntax
public var mdnTo: String {
get {...}
set {...} }
Default Value
""
Remarks
If this property is set, a Disposition-Notification-To header will be added to the request, and an MDN will be requested. You should specify a valid email address; you might, for example, specify the same e-mail address as in From.
By default, the class will request a PKCS#7 signature signed over SHA-1. You may set MDNOptions to customize this.