Finding what packages a given package depends on
Hey, I'm sure this question has been asked many times before, but every other dependency post I could find talked about having to install missing dependencies. I would like to know how to find what packaged depend on another one. Like a list of all packages that depend on Fetchmail or something like that. I'd like to get rid of a lot of stuff, but i want to make sure nothing else needs it first. Thanks for your time!
Athlon II X2 240 @2.8 GHz
2 GB G.Skill ddr2 pc2-6400
500 GB Western Digital Caviar Blue HDD
40 GB Western Digital HDD