Benefits and Issues: Both of the aforementioned narrations are weak. However, it is established from other authentic narrations that the Messenger of Allah (sallallahu alayhi wa sallam) used to have letters written in this manner: that he would write his own name before the name of the addressee, as will be mentioned in the following chapter and hadith.
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 5135