something is USED TO/FOR

"something is used to ...(F.EX.:this adress is used to reply to fan mails)

direccion ES USADO o ESTA USADA:o?

gracias

I think I got a bit tired by the time this question was born! It is obvious for me that it is imperative : SE USA)))

Hi Irene, "se usa" is not imperative, but this is the form which would be used here.

se usan estas señas para ....