the e-mails of some people never show in the incoming mail, only shown if such address is put in the "searching" , also some sent ones never appear en the corresponding list.

Los correos de varias direcciones nunca aparecen en el correo entrante ni en el coreo no deseado. Si se ponen tales direcciones en "buscar" entonces si aparecen en la lista que se abre. Lo mismo sucede en algunos correos enviados a determinadas direcciones.

Many emails addresses never appear in incoming mail or junk mail. If you put such addresses in "search" then they appear in the list that opens. The same applies to some e-mails sent to certain addresses.