  We regard anisotropic Maxwell's equations as a boundary control and
observation system on a bounded Lipschitz domain. The boundary is split into
two parts: one part with perfect conductor boundary conditions and the other
where the control and observation takes place. We apply a feedback control law
that stabilizes the system in a semi-uniform manner without any further
geometric assumption on the domain. This will be achieved by separating the
equilibriums from the system and show that the remaining system is described by
an operator with compact resolvent. Furthermore, we will apply a unique
continuation principle on the resolvent equation to show that there are no
eigenvalues on the imaginary axis.
