messages with [S] at start of the nickname who sent the message, when
the message was successfully verified, [?] if the message could not
be verified since the public key of the sender isn't cached locally,
-or [F] if the signature verificationn failed. If you do not have
+or [F] if the signature verification failed. If you do not have
the sender's public key you can fetch it with GETKEY command.
If you don't want to verify the signatures from received messages