Testing email functionality in Drupal is a common use case every developer encounters frequently. Setup a full-featured email system locally or using a 3rd party service for just testing emails may not be feasible always. Mailhog is the best solution available for this scenario and the bonus point is that it works perfectly with Lando.
A website will be having two kinds of users mainly, users with administrative privileges and simple users. Most of all a single root user. An administrator one of the main challenge will be in monitoring the site users and its contents. Admin should be notified regarding the new user registration and extra add-ons, etc. For a website with multiple users managing site contents and updates from user roles could become a nightmare.