What is required to send bulk emails that are not opted in? Lets say I only want to send 5,000 emails per day and get them in-boxed. I can't use gmail because I get locked frequently, otherwise each gmail account can send 500 emails per day. What do I need? How many services or software ? These network services like sendgrid or mailjet will not accept my list. I am looking for something that will accept bounce rates . These are spam emails. Means they never know who I am and never allowed me to collect their emails. I will send them short emails with a link that is not harmful.