I have talked to a few other people and they have had similar problems, thought someone here might have a solution. Basically we are using Qmail to send emails

I have talked to a few other people and they have had similar problems, thought someone here might have a solution. Basically we are using Qmail to send emails out from our website (ruby on rails). Everything seems to be working except for hotmail, where they always go to spam. We are using a hacky solution at the moment but that limits how many emails we can send, does someone have a good way around this, paying a small price per month wouldn't be too bad for a solution.