What to do with mails from previous tenants?

I've lived in my place for over a year now, and today I checked my mailbox only to find a lot of mail, especially from the previous tenant. It seems the Juristic Office isn't taking care of this issue. While I don't mind getting mail, most of it is junk that I won't read. What do people normally do with mail that's not theirs? LOL. It's cluttering the mailbox, and I don't know what to do.