sign a pgp-mail: which key to take mine !?!?!?

[sayhello]

a friend sent me his public key

note: i have pgp on opensuse 13.1 running with kgpg -

and i have generated a keyset.


now i want to send a crypted email to my friend

question: with which key i have to sign a mail : with mine or the key of my friend - that is the one that receives the e-mail.

in other words: when i open the editor of Kgpg - and paste the message-text into the editor - i subsequently have to sign this: with which keys i do that.

- with mine (that is corresponding to my mail ? - or
- with one that corresponds to his maiil adreess?


need to know that. if i have to write more - let me know..

thanks in advance

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