msg_crypto->decryption_status = NOTMUCH_MESSAGE_DECRYPTED_FULL;
else if (msg_crypto->decryption_status == NOTMUCH_MESSAGE_DECRYPTED_NONE)
msg_crypto->decryption_status = NOTMUCH_MESSAGE_DECRYPTED_PARTIAL;
msg_crypto->decryption_status = NOTMUCH_MESSAGE_DECRYPTED_FULL;
else if (msg_crypto->decryption_status == NOTMUCH_MESSAGE_DECRYPTED_NONE)
msg_crypto->decryption_status = NOTMUCH_MESSAGE_DECRYPTED_PARTIAL;