Solution:
$ torsocks pacman -S swaks perl-net-ssleay
$ nano notes.txt
$ torsocks swaks --server tmg3kli67jlbcduh.onion --to endwall@tmg3kli67jlbcduh.onion --from me@returnaddress.onion --helo "returnaddress.onion" --tls --body notes.txt
encrypt notes.txt with my public key for extra points.
Status: Just tested it, working.