  The fundamental quasinormal resonances of charged Reissner-Nordstr\"om black
holes due to charged scalar perturbations are derived {\it analytically}. In
the WKB regime, $qQ\gg\hbar$, we obtain a simple expression for the fundamental
quasinormal resonances: $\omega=qQ/r_+-i2\pi T_{\text{BH}}(n+{1 \over 2})$,
where $T_{\text{BH}}$ and $Q$ are the temperature and electric charge of the
black hole and $q$ is the electric charge of the field. Remarkably, our results
show that the relaxation dynamics of a perturbed Reissner-Nordstr\"om black
hole may saturate the recently proposed universal relaxation bound.
