Send verification links to newly registered users and ask them to confirm their email address to activate their account.

Keep your user data up to date by prompting the user to confirm their data every X days or X logins.

SUA – Secure User Account WordPress Login is a plugin that will allow you to secure your account

Adds advanced email address validation to forms using Expert Email Validator API. Prevents typos in email address field and eliminates spam submissions with fake email addresses. Email validation is performed via API on the api.expert-it-service.de.