Google / SMTP error code 550
smtp;550 5.7.1 [x.xx.xx.xx] Our system has detected that this message is likely unsolicited mail. To reduce the amount of spam sent to Gmail, this message has been blocked. Please visit https://support.google.com/mail/?p=UnsolicitedMessageError for more information. - gsmtp
Critical severity
Gmail has determined your messages are unsolicited, so messages are now permanently rejected. See Google's documentation for best practices to monitor and investigate this.
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