Email delivery problem to users signed up with Facebook SSO

Unsolved Technical Support
  • When users sign up using Facebook SSO , Facebook creates a random-numbered email address for them such as [email protected]

    I think a similar problem was already reported here:

    However, all emails sent to these kinds of addresses are returning back to us. This was already happening, but it was not bothering us so far 😄 unfortunately, recently we started to have a lot of "Delivery Status Notification (Failure)" emails... so, we would like to solve this.

    Address not found
    Your message wasn't delivered to [email protected] because the domain couldn't be found. Check for typos or unnecessary spaces and try again.

    And on the Facebook postmaster page, we can confirm the problem as "RCP-P1 The attempted recipient address does not exist."

    Since the forum sees these accounts as valid and activated, it keeps trying to send an email at any action that causes email delivery. And of course, all emails are being failed to be delivered and returned back to us.

    Any suggestion?

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