(Fix) Don't send email notifications to users with unverified emails

[Roardom]

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[what-the-diff]

PR Summary

• shouldSend Method Update
  Refreshed the functioning of this method in many classes. It now checks whether a user's email address is verified before trying to send an email.
• User Model Integration
  The User model was brought into several classes. This provides access to user-specific attributes necessary for the updated shouldSend method.