In early Islamic Egypt, “Arab-style” Greek (and later Coptic) letters employing religiously neutral monotheistic formularies were sent in the name of Muslim officials to Christian administrators. By analyzing old and new evidence of Egyptian Christians using this epistolary template, this paper argues that in the first decades of Arab rule, probably only a few beneficiaries of the new regime employed the “Arab-style” prescript in their letters written to other Christians to demonstrate their close connection to the new government and thus their social standing. Later, however, the “Arab-style” prescript became commonplace in communication between Christians and Muslims and among Christians only in everyday life. Thus, the religiously neutral template created by the conquerors for official top–down communication became a mechanism for facilitating not only the smooth functioning of administrative structures, but also, in the long run, the social cohesion of Christians and Muslims.