If you already have your OpenPGP public key published on Public key servers, then make sure to update its Revocation status/Expiration date there (each time you modify it) by using this feature.
1. Go to Settings -> Messages -> Encryption and click on your OpenPGP key pair under My Personal key.
![publish or update your openpgp public key on public key server](https://kb.mailfence.com/wp-content/uploads/2022/03/how-to-publish-update-your-openpgp-public-key-on-public-key-server-3.jpeg)
2. Click on Publish on public key server.
![publish or update your openpgp public key on public key server](https://kb.mailfence.com/wp-content/uploads/2022/03/how-to-publish-update-your-openpgp-public-key-on-public-key-server-4.jpeg)