Make sure to first add the External address via IMAP or POP protocol.

- Compose a message.
- Choose sender address corresponding to your external account by clicking on the drop-down in From field.
- You can choose to Send:
- Password encrypted email.
- OpenPGP encrypted & signed email.
- OpenPGP signed email.
Note: The deliverability of sent emails may be inferior due to potential SPF and DKIM policy checks.
To decrypt encrypted emails:
- Decrypt OpenPGP encrypted email.
- Decrypt Password encrypted email.