How to apply a patch and conserve Bruce G's structure?

[Johan Almqvist]

Hi

I'm running qmail installed from Bruce Gunthers rpm and I'm very happy
with that. However, I will have to install a patch that disallows the use
of more than one @ sign (or % sign) directly in the smtpd RCPT TO: phase.
How can I achieve that without breaking everything else?

(The reason for this is that all machines that accept mail with more than
one @ or % get their port 25 locked from the outside world by campus
network administration...)

-Johan
-- 
Johan Almqvist