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How to bypass the spam error after 20 mails?

us flag

I have a web app that sends bulk email to different clients. It generates custom invoices and sends those attachments via mail. But after 20 mails I get this error

smtplib.SMTPDataError: (554, b'5.2.0 STOREDRV.Submission.Exception:OutboundSpamException; 
Failed to process message due to a permanent exception with message WASCL UserAction verdict is not None. 
Actual verdict is TransientError. OutboundSpamException: WASCL UserAction verdict is not None.
Actual verdict is TransientError. [Hostname=PS2P216MB0259.KORP216.PROD.OUTLOOK.COM]')
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