At times, these email clients throw up errors like “550 5.7.1: authentication required” resulting in email failure. Show Email users will be confused when they can’t figure out the exact reason for the auth failure. That’s why we get frequent requests from customers to solve mail errors as part of our Server Management Services. Today we’ll see the error in detail and discuss how our Support Engineers fix this error. What is Error: “550 5.7.1 authentication required”?Firstly, let’s have a deep look at the exact error. This mail authentication error has three parts:
In short, the error “550 5.7.1 authentication required” is a permanent failure that occurs due to incorrect credentials provided by the user. Why does it happen?We now know the details of the error. It’s time now to check on why it happens. Email security is of much importance while sending any sensitive information. The absence of account validation could lead to attacks from spammers who use the server to send unnecessary emails. Spamming from the server will end up in email server blacklisting too. Therefore, server administrators always allow emails only from authenticated senders. And, when authentication fails, server reports error. There are two possibilities for this auth failure error. 1. Incorrect login detailsSome users give incorrect user name and password while configuring an Email client. This can be typing errors like extra space, typo errors in entering user details, etc. When the server identifies the connection from a non-existing user, it automatically denies the mail sending with an error. 2. Configuration details of Email clientUsually, incorrect mail client configuration can also result in Email errors. The configuration details vary for different Email clients. For mails to work, the user should enable the option for authentication in every email client. Therefore, we always ask customers to check the configuration details in email clients. How we fix error “550 5.7.1″?Curious to know the fix? When this error happens, our Support Engineers begin the investigation by checking the mail server logs. For example, in a cPanel Exim server, we check the logs at /var/log/exim_mainlog. This gives us a clue on exactly what has gone wrong with the email client configuration. Generally, the incorrect credentials, typo errors, extra spacing, etc. will be readily viewable from logs. If we find mistakes, we suggest the users double-check the given credentials like email username and password in the mail client. Similarly, not enabling the SMTP authentication in email clients could also cause the same error. For users configuring Outlook, we suggest the following steps to enable the SMTP authentication. Move to Account Settings>>More settings>> Outgoing server There is an option to enable “My outgoing server (SMTP) requires authentication”. Enable it and results would appear as:  [No luck in solving email errors? Seek expert help here.] ConclusionIn short, error “550 5.7.1 authentication required” occurs as a result of providing incorrect credentials or due to not enabling SMTP authentication in the mail client. Today we discussed the various causes of the error and how our Support Engineers fix it. PREVENT YOUR SERVER FROM CRASHING!Never again lose customers to poor server speed! Let us help you. Our server experts will monitor & maintain your server 24/7 so that it remains lightning fast and secure. The error message 530: 5.7.1 Authentication required can have several causes. One of the most common causes of this error message is that the outgoing mail server is listed on a DNS Blackhole List (DNSBL). DNSBL lists are also known as spam blacklist servers. The message was consequently rejected by our system. You can check for yourself whether an IP or a mail server is on a DNSBL list, for example via a blacklist check. To check the IP address or domain, we recommend this tool, for example: https://mxtoolbox.com/blacklists.aspx Enter the domain or IP address of the outgoing mail server. If the result is negative, contact the sender or the administrator of the outgoing mail system. Gmail Help Sign in Google Help
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