This help article explains how you can remove your public S/MIME or OpenPGP key from the Posteo key directory.
Others can then no longer access the key from the key directory.
Removing the key from the Posteo key directory
- Click Settings in the webmail interface
- Click My account
- Click PGP and S/MIME encryption
- Under Key administration click remove
You have now removed your key from the Posteo key directory.