I have user table created by Identity.

I want to send an email to corresponding user if he did not update his password for six months. I have to send mail after 60 days and after that every 3 days. I am using .net framework 4.5.2, asp.net, mvc 5, identity2
My model

    public class IdentityUser : IUser
    {
        public IdentityUser();
        public IdentityUser(string userName);
        .
        .
        public DateTime LastUpdateDate{get;set;}
    }

My controller

public ActionResult PasswordSendMail()
{
    my code for checking six month...
}

But the mail has to be sent once at the 60th day from the LastUpdateDate and after every three days.
If i placed the code in controller, the action should be called. I have to send without calling any controller specifically.
I want to sent mail to users, whether user is logged in or not. when the time reached the mail should be sent by background process. Thanks in advance