Please sign, and encrypt emails to me with my public PGP key. If you receive an email from me, it will be signed using my secret key. If it isn't, assume it has been tampered with or spoofed altogether. It will also be DKIM signed. PGP public key fingerprint:
DF70 D8E5 FBD6 8519 9257
C44C 0DA6 8B1E 1801 A332
I run my own Matrix server and it's fully federated, so you can contact me from any other Matrix server.