Rails 4 sends email with BCC

I posted an email with bcc in rails 4 but it doesn't work for me. How can I send it and also I tried to pass the email array to bcc.

default from: "test1@mail.com"
mail(to: "sample@mail.com",reply_to: "test@mail.com",
      bcc: "test1@mail.com",  subject: "sample subject")