I would not worry about it. Usually when they do not validate the email they are spammers and you do not want them on there anyways. If you know for a fact that they are not a spammer then do a check but most of the time when someone signs up and then does not validate the email quickly one of two things has happened.
1. They are a spammer and you did not want them anyways or
2. The email went into their junk mail folder and they have not checked that.
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