How To Prevent Important Incoming Emails From Being Filed Into Your Junk Mail Box

How do I prevent important incoming e-mails from being filed into my junk mail box?

A lot of spam filters you need to program and start to teach that spam filter, "Hey, this is not spam when it comes from XYZ." You can also create rules within most e-mail applications to say anything from this e-mail address, please send to my inbox or do not send to my junk box. You also have ability to set your spam filter from a very high extreme setting to none at all. You can go from low to medium to high. You might want to play around with sort of that application to see how much spam you get in your inbox when you start to remove the variation.