There are two factors: the number of clicks and the number of verified mails. You need at least 20 verified mails so that your mail is considered as such. I believe you have to wait until 7 days after you posted the mail to see whether you reached that amount. If you did, you will get rewards in the form of Listnerds.
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20 verified mails or 20 upvotes on a mail link to be considered that mail as verified?
Blue count as + 1, red as -1. In total it has to be over 20 to be considered as verified.