Creative account verification without emails

Question

I use email authentication to provide users with full use of the site. The problem is that sometimes these emails get spam-boxed or never arrive, so I get a lot of people complaining that they can’t confirm their account.

I wonder if there are other (creative) ways to offer a secondary check for users who have not received the check. This is a free site, so I do not want to request credit cards or mobile #.

The goal of this is to make site abuse less common as we ban many people and they come back with dozens of accounts to prove something. Spam / robot registration is not a problem (right now).

Answer 1

What we started doing recently allowed participants to send us an email to a special email address. We give them a hash code, and all they need to do is put this code somewhere in the subject or in the body of the letter and send it to us. We have a cron job running in the background that receives these emails, analyzes the subject / body looking for the hash, and if found activates the account.

It does not work 100%, because some Internet service providers also block users from sending emails to us, but not a single solution will work 100%.

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