Protokolu ti a n lo lowo bayi je afikun mo protokolu akoko ti alaye re wa ninu iwe RFC 2821.Itokasi Awon protokolu Internet.. 
Ó gba ìrànlọ́wọ́ láti ọ̀dọ American Association of University Women tí ó fi tẹ̀ síwájú nínú ẹ̀kọ́ rẹ̀.. 