dep wrote:
that's actually a signature by me. i put it there intentionally because i think secure mail is a good thing and that people ought to know that it exists.
perhaps I misunderstand what protonmail is, but if I sign the message with GPG or PGP/MIME, I would have the signed message and can verify by the signature that it was not altered. I look at your signature - it is advertisement - no use of this unless I get a signature.
regards