Bulk Email Solution

I am looking for a solution to getting emails into the inbox of recipients. I have an opportunity that I would like to promote in this way. I have my own lists of emails and need someone who I can work with to send to these lists and possibly to create, organize and send the emails. The most important variable will be the platform and it ability to get emails into the inbox. Please tell me why your email platform is better and how it works. Also give me an idea on pricing and what type of packages you would offer. Would there be someone to help in various ways and provide help if needed? It would also be beneficial to set up an auto responder for emails to go out after they opt in for more information. I already have the messages to be placed inside the auto responder. I will look forward to hearing back from anyone who has expertise in this area. Thank you!!