Click on the kodamail tab and then the Public / Private Key admin link as shown below:


Then "Your key pairs":


If you have published your public key to a key server and decided that it should not be used anymore then you would revoke it.
This is done using your private key as only you have access to your private key. Simply click on the revoke link, you will be asked for the passphrase:



The public key in your "Key pairs" and "Public keys" will be re-written with a revocation signature indicating it was revoked.
Then you should upload the public key to a public key server.
Anyone trying to use the public key will get a warning that the key has been revoked and cannot be used.
It's recommended to create and publish a new public key before revoking the old one.

It's currently not possible to delete a public key from a public key server but you can revoke it's use.
Once a key has been revoked, it cannot be undone. Use a 'test' key to try it out.

When a key has been revoked it will show like this:


'Delete this key pair from your Key Pair Store' will also remove the public key from your 'Public keys' store.
You will be asked for the passphrase for the private key, this is to ensure that only you can delete the key pair,
not someone who happens to be using your computer.