initial pass at pop3 client
checkpoint
fix test errors
Add pop3 to test_account_create_unit
terrible rough syncing hacky attempts
make test_incoming_prober work
checkpoint
test_account_bad_password_error works!
downloading and reading messages works!
cleanup, some log removal
Documentation updates
test_body_observers works
test_compose works!
test_mailapi_contacts works
.
.
.
works
all tests pass as before
.