  We review gauge invariant $\mathcal N =1$ supersymmetric massive $U(1)$ gauge
theory coupled to matter and Stuckelberg superfields. We focus on the leading
order self energy and vertex correction to the matter field in the massless
limit of both the $U(1)$ vector superfield and the Stuckelberg superfield. We
explicitly verify that the theory is infrared divergence free in the massless
limit. Hence the Stuckelberg mechanism appears to be the efficient route to
handle infrared divergences seen in supersymmetric quantum
electrodynamics.Since these additional particles have very small masses they
can serve as dark matter candidates through `Ultralight particles' mechanism.
