transferring to sendmail 8.9 while still using hamm

["Chris Evans" <chris@psyctc.sghms.ac.uk>]

I'm using Hamm happily (well, almost, see "LI but no LO" if you're 
on the debian-user list!)

I want to move my sendmail on my two working machines up to 8.9 
for the improved and built-in antispamming facilities there.

That looks as if it will require a move to a more recent libc6, 
netbase and libdb (and I haven't yet worked out what they might 
also want!)

I don't want to move over to slink yet and my real priority is not to 
break anything that's not broken nor to do work I don't need to do.

Anyone done this and found it worked with just the upgrade to 
those three dependent packages?

Anyone know things well enough to reassure me or to tell me to 
wait for slink to become the new stable?

TIA,

Chris