SMTP Access Restricted error: 554 5.7.8 for app outgoing mail

SMTP Access Restricted error: 554 5.7.8 for app outgoing mail

Good day

We have been experiencing failed outgoing mails from our app with the above error showing. Tried googling the problem and nothing's coming up. Could you kindly please assist as our app is heavily reliant on these emails. Full error as below.




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