Hello!
I have completed several email marketing projects similar to yours and would be happy to offer my services for your task.
How much data do you have on the people you are emailing? Ex: First name, last name, etc. It's a good idea to use merge tags where possible using this data. That way every email is somewhat unique, which helps prevent spam filtering. Also the pace at which the emails go out can contribute. What are you using to send the emails?
Thanks!