Disclosed are various embodiments for performing stateless verification of communication addresses. The apparatus includes a plurality of light guides, each including: a first mirror at an entrance face, including an aperture for admitting light therein from a respective one of the plurality of coherent light sources; and a second partially-reflective mirror at an exit face. A separation unit is carried within the housing. Two, three or more of said elements may be adapted to be inside andor outside the rim of the container.