In a nutshell, this message is a non-delivery report (NDR) or delivery status notification (DSN) of emails. The server response was 550 5.7.1 Unable to relay" "The SMTP mail system returned the following error: (0x8004020F): The server rejected one or more of the recipient addresses. Sometimes, the email delivery may fail and the following message may get relayed back to the server - an SMTP error code 550 5.7.1, In Exchange, after enabling the IMAP or POP3, you must configure the authenticated SMTP settings for users so that they can send emails. It is responsible for sending data over the network.
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