  In a previous paper (Paper I) we developed a technique for exactly solving
the linearized Boltzmann equation for the electrical and thermal transport
coefficients in metals in the low-temperature limit. Here we adapt this
technique to determine the magnon contribution to the electrical and thermal
conductivities, and to the thermopower, in metallic ferromagnets. For the
electrical resistivity $\rho$ at asymptotically low temperatures we find $\rho
\propto \exp{(-T_{\rm min}/T)}$, with $T_{\rm min}$ an energy scale that
results from the exchange gap and a temperature independent prefactor of the
exponential. The corresponding result for the heat conductivity is $\sigma_h
\propto T^3\,\exp{(T_{\rm min}/T)}$, and thermopower is $S \propto T$. All of
these results are exact, including the prefactors.
