Hey, Cul…
You can ‘zip’ the file(s) with a password and send them too (telling the password in the email) or, better, you can disable the scanning of the outbound mail and send them too.
Anyway, the best way is send the file by the Chest (but I thought this was a Pro version feature…). Take care, set the correct ‘maximum size’ for the sent files to Alwil. 