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What is a 'Mail block - relay denied' error?

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‘Relay’ refers to the transmission of an email from one server to another. Your email has bounced due to a temporary error, which could be on the sending or the receiving side. 
This type of bounce usually occurs:
  • when the sender’s message is not authenticated, or 
  • due to a misconfigured server on the recipient side.
To know more about Email Bounces and Error Codes, click here.
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