Disposable emails have both advantage and disadvantages!
If a user lost his password there is no way to reset it
Cuz it is disposable the email sent from the server will bounce back, providers like AWS SES, Sendgrid hate bounces, if your bounce rate is above 10% they will block the website's email address
There is the possibility to steal someone's account if you see anyone can log into someone's email and request for reset password.
For further actions, you may consider blocking this person and/or reporting abuse
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Disposable emails have both advantage and disadvantages!