Hello,
FYI:
Dim MyMapiMessage As MapiMessage = MapiMessage.Load(str, loadopt)
MyMapiMessage.Headers.Set("X-Mailer"...
Dim SignedMessage As MapiMessage = New Email.SecureEmailManager().AttachSignature(MyMapiMessage, MyC…...protection.outlook.com (40.92.66.81)...BN8NAM04FT057.eop-NAM04.prod.protection.outlook.com (2603:10b6:408:111:cafe::93)...