[exim] Hiding Exim and OS version in email headers

Hello,

Been googling to find how I can hide Exim and OS version in email headers.
Something like this:
Received: from www by lists.lc-words.com with local (Exim 4.67 (FreeBSD))

I have found references to smtp_banner but this applies to EHLO for
incoming connections, doesn't it?

Can you give me an idea how to remove software version? Or maybe there's no
need to do so at all? I know Exim's safe by default.

Thank you very much in advance!

Zbigniew Szalbot