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Resolve a “535 5.7.0 authentication failed” error
The email authentication service present on our servers may exceptionally encounter a problem for a few brief seconds during unusual events in our infrastructure.
If an error "535 5.7.0 authentication failed" occurs, try sending the email message again and it should send.
If the problem persists, we invite you to check the points in this guide (click here).
Link to this FAQ: