With PGP, you can make sure that I’m the only person able to read your message.
Just encrypt the message with my public key and send it to one of the contact options.
To use PGP, you could use Kleopatra.
Read more about PGP here.
-----BEGIN PGP PUBLIC KEY BLOCK-----
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TmqkRBCdLYnMljm16eNAO0uitks=
=2AOj
-----END PGP PUBLIC KEY BLOCK-----