![]() ![]() The error ‘550 5.7.1 Unable to relay’ is a cryptic error code by HTTP protocol, which restricts users from sending emails. What is SMTP Error 550 5.7.1 Unable to Relay? As a result, the message is relayed back to the server. The error 550 5.7.1 generally implies that the user is not authorized, and therefore, fails to send emails. 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. ![]() MY SQL Toolkit3-in-1 software toolkit to repair Corrupt Mysql, MariaDB & Analyze logs, and Interconvert Databases.Įxchange server uses Simple Mail Transfer Protocol (SMTP) to send emails from an email client to the server and vice versa. ![]() Also supports recovery from RAIDs & Virtual Drives.
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