The IP you’re using to send mail is not authorized to 550-5.7.1 send email directly to our servers. Please use the SMTP relay at your 550-5.7.1 service provider instead. Learn more at 550 5.7.1 https://support.google.com/mail/?p=NotAuthorizedError n16si15152994qtx.119 - gsmtp (in reply to end of DATA command))
This is message returned when email is sent to gmail through postfix installed in the droplet.
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