  We consider states in the adjoint representation of the Standard Model gauge
group as messengers for mediation of supersymmetry (SUSY) breaking. These new
messengers can shift the gauge coupling unification to the string scale at
O(5x10^{17} GeV) if their masses are at O(10^{14} GeV). The predicted SUSY mass
spectrum at the electroweak scale is significantly different from those in
other gauge-mediated or supergravity models, resulting in robust mass
relations. The gravitino mass is predicted to be about 1-10 GeV. The heavy
messenger sector could provide a superheavy dark matter candidate.
