[MM3-users] delete unverified accounts

Hi, I'm noticing that a lot of 'spammers' are registering themself via postorius. They do not send emails, neither they are in any list, so they are not technically spammers, but they are a lot [maybe around 500 subscribed in the last month]. While waiting for a captcha system[0] for the main distribution, I'm looking for a rapid/easy way to delete this accounts; since they are not 'verified', I was wondering if I can locate this information in the mailman3 database or if there is some easier way to delete all unverified accounts. Do some of you any help or indications? I'm using GNU Mailman 3.3.9 (Tom Sawyer). Thanks, noemi for pangea.org

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