Method 2: Contact Recipient or Recipient’s Email AdminĪs mentioned earlier, if the sender’s address is not recognized by the Outgoing Mail Server, the email delivery may fail. Checking the application event logs will help you analyze the actual cause and time when the 'Exchange SMTP Error 550 5.7.1 unable to relay' error message is generated. Method 1: Check Event LogsĬheck for all existing Exchange server errors in the application event log and search for corresponding resolution methods online. You also need administrator access and permissions to execute the commands and steps discussed below. Hence, good know-how of the Exchange server processes is essential. However, you may require considerable technical expertise to execute the steps. How to Fix Exchange SMTP Error 550 5.7.1 'Unable to Relay'?īelow we have provided a few manual solutions to fix Exchange Error 550 5.7.1. Most commonly, the reason could be database corruption or the nonexistence of a specific Recipient's policy for the particular domain in the user's department in the Exchange server database(s) that results in this error message. Sending an email to a large distribution group.The Recipient Policy of the recipient domain blocks the emails from the sender domain.The sender address is not recognized by the Outgoing Mail Server.Authentication failure/don’t have permission to send messages to the recipient.There could be various reasons responsible for the occurrence of Exchange SMTP error 550 Unable to relay error. What Factors are Responsible for SMTP Error 550 5.7.1 'Unable to Relay'? It can be considered as a security-specific error message if it prevents unauthorized users from gaining access to the Exchange server for relaying emails. The subsequent digits display if any connection or syntax error exists.The first digit describes whether the Exchange server accepts the command, encounters an error, or commences appropriate action.The description of the error 550 Unable to relay a message is as follows, In such a situation, you need to fix the SMTP error 550 by understanding the meaning and reason for the occurrence. It usually consists of three digits where each digit defines a particular attribute. ![]() The error codes describe important information about the persisting problem. 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. Exchange server uses Simple Mail Transfer Protocol (SMTP) to send emails from an email client to the server and vice versa.
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