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