alot doesn't try to automatically decrypt messages sent from Bitmask Client Bundle

Steps to reproduce:

• Use latest Bitmask Client Bundle (bf1984d8)
• Send an email to another account.
• Check the account with latest alot (0.4, from pypi).

Expected behaviour: alot should be able to detect that it is an encrypted message and try to decrypt it automatically.

Observed behaviour: alot shows an application/pgp:msg.asc attachment and doesn't try to decrypt it and show it.

Here is the source of the message, as it arrived: source.txt

Note that it works fine in mutt.

I am not sure if this is a problem from bitmask, pixelated, or alot.