SenderCertificatesSource (SecureMail Adapter)
Specifies sender certificates source type.
Sender Certificates Source
Use this property to specify the type of the sender certificates source.
The certificates contained in a file can be specified in two different ways. One is to set Sender Certificates Source to File, and assign file name to the SenderCertificatesValue property.
Another way is to use SMIMESenderCertificates property. If the latter property is not empty, the contents of Sender Certificates Source is ignored.