So, habe jetzt den Code so verändert, dass in der Mailbox die Mail erstellt und abgesendet wird. Allerdings WIEDER mit meiner Kennung:
Dim Workspace As New NotesUIWorkspace
Dim Session As New NotesSession
Dim Mailbox As NotesDatabase
Dim MailDoc As NotesDocument
Dim UIDoc As NotesUIDocument
Dim MyServer As String
Dim MyMailbox As String
MyServer = Session.CreateName(Session.GetEnvironmentString("mailserver", True)).Abbreviated
MyMailbox = "mail.box"
Set Mailbox = session.GetDatabase(MyServer, MyMailbox)
Set MailDoc = Mailbox.CreateDocument
Set UIDdoc = Workspace.CurrentDocument
MailDoc.Subject = "Kurzinfo"
MailDoc.sendto = "empfaenger.mail.de"
MailDoc.From = "absender@mail.de"
MailDoc.Principal = "absender@mail.de"
MailDoc.Body = "test"
Call MailDoc.Send(False)