System.Exception: Error, unable to determine senders address.

[fahrplaner]

Hi. What can I do to fix this error:

Application_ItemSend

System.Exception: Error, unable to determine senders address.
at OutlookPrivacyPlugin.OutlookPrivacyPlugin.GetSMTPAddress(MailItem mailItem)
at OutlookPrivacyPlugin.OutlookPrivacyPlugin.Application_ItemSend(Object Item, Boolean& Cancel)
?

Happens when I re-edit a saved draft message and encryption is enabled. Sendig the same mail copy&pasted in a new mail does work...