When the username and password entered in the Email client are incorrect, it ends up in Error 535. Now, let’s see the reasons behind this error and how our Support Engineers correct it for customers.Ĭauses For the “Error 535: Authentication failed”įrom our experience in managing servers, we often see customers experiencing Auth error 535 due to the following reasons: That’s why, Email client configuration always need special attention. “SMTP Error (535): Authentication failed” error is usually related to the bad user email settings in Microsoft Outlook. īut, for any reason, if the authentication fails, mail client like Outlook generates an appropriate error message. Later, to download the mails E-mail clients use either POP or IMAP protocol. Mail client like Outlook uses SMTP (Simple Mail Transfer Protocol) to send messages. Today, we’ll see how our Support Engineers help our customers to resolve such tough email errors. Occasionally, mail servers may reject emails with some strange errors, such as “SMTP Error (535): Authentication failed”Īt Bobcares, we often get requests from customers to fix SMTP errors as part of our Technical Support Services. Everyone expect mails to work flawlessly, but that doesn’t always work.

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