Multiple keys for one email (Passwords and Keys)

Multiple keys for one email (Passwords and Keys):

I imported somebodies public key into my Passwords and Keys but when I did I got four new keys in the list. When looking at the properties of those keys one of them belongs to the email of the person whos public key I imported and the other three are linked to other emails (I don’t know those emails). My question is how do I encrypt an email that I want to send to that person? Using just the key that is linked to their email or all four keys that I got?

submitted by /u/e456-n
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