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 550-Please turn on SMTP Authentication in your mail client, or login to the 550-IMAP/POP3 server before sending your message

Error Message: SMTP error from remote mail server after RCPT...

 Domain has exceeded the max defers and failures per hour (5/5 (100%)) allowed. Message discarded.

Error Message: Domain domainname.com has exceeded the max defers and failures per hour...

 This message looks like spam.

Emails not getting delivered to an account on our server, would normally bounce with an Error...

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