http://hg.slitaz.org/wok/rev/883b1b954136

I see that. what do I do with that?

With this receipt buildbot have cooked the package. It's here : http://mirror.slitaz.org/packages/cooking/masqmail-0.2.28.tazpkg

If you use cooking (as root) :

tazpkg recharge
tazpkg get-install masqmail 

Else : (as root too)

wget http://mirror.slitaz.org/packages/cooking/masqmail-0.2.28.tazpkg
tazpkg install masqmail-0.2.28.tazpkg

There's information about tazpkg in the handbook and about cooking packages in the cookbook : doc.slitaz.org

wow holly cow, that is incredible. This distro definitely has something going on.