> When you have a networks that has four or five geographically
> separated servers, a few gateways to other mail systems and the like
> then you will find that the standard m4 macros just don't seem to do
> what you want and you need to fall back on inserting your own rewrite
> rules into the sendmail.cf.

Well, since most people have a rather simple setup, it's probably a good idea
to first try to see what you can get with the m4 macros and only if you
find them too limiting, you can try and hack on sendmail.cf.
And if sendmail.cf ends up being too limiting, go for hacking on the source.


	Stefan