Many students don’t like to register for sites because of this fact. You can always keep a dummy email for sites that you know will spam you, (like mine email@example.com).
If you really don’t care about getting mail from a website, you might like a throwaway email like dodgit.com. It allows you to make a temporary email just long enough to log in to your new web services. Dodgit even allows you to monitor the email address via RSS feed in case there actually is something interesting in there.
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