upgrading sendmail

[bas]

hi,
i am thinking of upgrading my base sendmail 8.12.8 (the one that came with
FreeBSD 4.8) to the one
in the ports collection , which is now 8.12.10. mainly because there are
some security issues from 8.12.8
and i thought upgrading the whole thing would be easier than patching the
source and all.
i was wondering what are the main things to keep in mind, like making
changes in the configuration or moving
some binaries? i looked all over the net (...) but haven;t found much
useful
information.
thanks,
 b.