This is necessary to tell the recipient's email client what to do with the data, and to ensure proper encoding so nothing is lost during transfer.
Nke a dị mkpa iji gwa onye na-anata onye ahịa email ihe ị ga-eji data ahụ mee, na iji hụ na ekwesịrị ekwesị ka ọ bụrụ ihe ọ bụla furu efu mgbe ị na-ebufe ya.