It was last night this problem arose, and I really forgot the reason I was doing this. But I have many times attempted to verify my Steam account or some other information. No email has arrived in either of the two email accounts I have. And I don't know which one to watch, because I cannot find a way to check which email address you are using or a way to edit it if it's wrong.
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This sounds like Steam's two-factor authentication. If so, the email it would be sending to would be found by going to Steam's website, logging into your account and checking your email address there.