e-Newsletter, how to send faster

I am currently using the WP Mail method in e-Newsletter as no other method will work for my host. The problem is that I set time between emails to 0 but it still takes a couple seconds per email to send.. meaning my 3000 member list takes hours to send and will get worse as we grow. My mail provider can handle sending all instantly... please advise on how to remove this delay so it doesn't send like a snail.