Hello, I have 500,000 email list of subscribers who will subscribe to it and they can verify the email id as well. But none of the awber or constant contact has listed price for this size and I am sure it will be very high and not affordable. So what is the solution to delivery so many emails on weekly or bi monthly basis? Inhouse software like inspire email marketer? or desktop software? or aweber? please suggest best solution for such quantity. Thanks in advance.