We often find ourselves in situations where someone contact us on support from the Cloudron dashboard but we have no way to reach them back because the appstore/cloudron.io email address is invalid. We have deployed email verification today. Starting Cloudron 6.4, you won't be able to open support tickets via the dashboard without verifying your email.
If you login to cloudron.io, you will see a banner:
Clicking that will send you an email to verify. For new users, this verification mail is sent during sign up.