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https://optimizeyourimage.com/docs/problems/email-domain-not-allowed

What it means

Sign-in was requested with a disposable email address. Because free monthly API credits are granted per account, throwaway inboxes are refused.

How to resolve it

Sign in with a permanent email address you control.

Retrying

Retry with a different address.

Include the X-Request-Id response header when contacting [email protected] about a specific failure.