Email solution for a 300k list?

I need someone to help me mail my 300k list 6 times a month.. let me know if you can do it and how much it will cost. The previous mailer I was using fell through and was no good.. I need someone who can communicate and doesnt want to take the money and run!..

i have no idea where to start.. i'd be willing to pay someone to help me find the right server and set it up..

PM sent