Seeing Undisclosed Recipients in the To: field of an email is a clear indication that other people received the same email, but you don't know who or why.
Ịhụ Ndị Na- anataghị Achọpụtara na Ntuziaka Na: ubi nke email bụ ihe doro anya na ndị ọzọ na-enweta otu email ahụ, ma ị maghị onye ma ọ bụ ihe kpatara ya.