well, maybe the simplest approach is to say "hey, would you like me to send you sensitive documents via email as i've been doing, or I could use certified regis

well, maybe the simplest approach is to say "hey, would you like me to send you sensitive documents via email as i've been doing, or I could use certified registered mail and include the over head of doing that in my billable hours", since as you've said, a tech solution kinda rules itself out