How to find what package (or port) a routine is in.

[reg at dwf.com]

I think the subject line says it all.
I'm looking for 'formail' which google FreeBSD formail shows me
exists in FreeBSD, but I have no idea how to find the package/
port containing it.

Someone point me in the right direction.
-- 
                                        Reg.Clemens
                                        reg at dwf.com