[Rpm-maint] rpm install - sed file - rpmsave for rollback

[Tom Brown]

Hi

Earlier i mentioned how i sed a file on installation of an rpm - This 
all works perfectly.

I now wonder how i can mark that changed file, which did not come from 
the package that seds it, so that if i remove that rpm the changes are 
rolled back.

ie - i install package X that changes the sendmail.cf and sets a smart 
host to my choice. If i then remove package X the sendmail.cf file gets 
reverted back.

I presume i do this by having %config(noreplace) /etc/mail/sendmail.cf 
but can i have that line as the only entry in the %files section?

thanks