Milter-greylist

With the new p0f code and postfix I get:

smfi_getsymval failed for {if_addr}

It seems this is not supported in postfix:

http://www.postfix.org/MILTER_README.html

I have hard-coded by if_addr in the source for testing for now, but it
seems the only real fix is to add if_addr to postfix. A kludge or
workaround would be to have wildcard support in p0f and use INADDR_ANY
for my adddr.