We recommend finding a host with spam box. Spam box is a email spam protection program that sends a email that has to be replied to with a special response. This will unlock your email. Mainly stay away from filters or spam lists, they are not accurate and people will get other email listed in them just to cause problems. The main thing is to make sure the email sender is a person or a site you want. This best managed through a spam box.
You can add a spam box to any email at spam arrest or quality hosts DWHS Web Hosting has them with there website and hosting plans.