Adding such a step seems like it would cause more problems than it would solve. It's going to deteur only the laziest of the laziest fraudsters since it's so simple to open up a free email account anywhere. In additonal, something like this might deteur legitimate signups since its another annoying step and the email will likely get delivered to the spam/bulk inbox or blocked outright due to the fact that the nature of the email is adult. One way that might work effectively would be to "flag" the account for manual review if just the email bounces.
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