Bulk email senders for our targeted email

We need long term bulk email senders for our targeted email campaigns. We are looking for experts who can make these campaigns for us. We do not care the system which way you send emails. Our expectations are 100% guarantee that emails go into inboxes of our clients(mostly hotmails) and the basic explanation of how you will do that. We are in Europe and have no American emails. All our campaigns are legitimate and legal business campaigns. All our mailing lists are opt-in emails, but complaints may occur sometimes. Our database is 60% active. We also want invalid emails to be cleaned. Senders can be from anywhere in the world. It must be reliable with good connectivity and good price. We expect experienced people who can show prior work or experience. We would also like to make some tests before starting the campaigns. We want 100% inbox guarantee. We are planning to establish a long time businnes and relationship.