Muhammad bin Sirin related that al-Ala' bin al-Hadrami (may Allah be pleased with him) wrote a letter to the Prophet (peace and blessings be upon him) and began it with his own name.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15253
Ibn Ishaq said: Al-Ala' bin al-Hadrami; al-Hadrami was an ally of Harb bin Umayyah bin Abd Shams. Ibn Ishaq said: Al-Hadrami's name was Abdullah bin Abbad bin al-Sadif, and he was called 'al-Hadrami' because he had come from the land of Hadramawt.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15254