How to turn on OpenPGP/digital signing for all outgoing mails?

1. Go to Settings > Messages > Encryption.
2. Tick the box Sign all my emails with my personal key.

Make sure you have the OpenPGP key pair/Personal key of all sender addresses.

Mailfence does not allow signing emails from revoked/expired OpenPGP key pairs/Personal keys.

The recipient will need to have your OpenPGP public key to be able to validate your digital signature. You can share your OpenPGP public key by email.