535 Incorrect Authentication Data

535 Incorrect Authentication Data

The error code “535 incorrect authentication data” occurs when there is an issue with the SMTP authentication details. In a few cases, this issue pops up when the permission of your mailbox is changed due to migrations. Whatever the cause is, you can resolve the “535 incorrect authentication data” issue efficiently when you implement the right strategy.


How To Resolve 535 Incorrect

Every email client uses the SMTP protocol for sending messages. When the server detects an incorrect authentication, it will generate an error code. Moreover, this error code differs depending on your email program. Here are the causes and the appropriate solutions to fix this error code.

Check Your Username/password

  • Step :1In case you have incorrectly entered your username/password, you will encounter the 535 incorrect authentication data error code.
  • Step :2Recheck the username/password you have given to log in to your email server. If you find any mistake, correct it and check whether your issue is resolved.

Disabled Account

  • Step :1If your account is disabled, you may end up with the “535 incorrect authentication data” error code.
  • Step :2So, check your account’s status to verify whether your account is active or not.
  • Step :3Your connection should be encrypted with SSL or TLS. If you have disabled this encryption, you will probably end up with the 535 incorrect authentication data error code.

Incorrect Authentication Method

  • Step : 1 If you have selected an incorrect authentication method that is not supported by your mail server, you will encounter the 535 incorrect authentication error code.
  • Step : 2 Log in to your control panel and check your account’s status to resolve this issue. Usually, if your account faces any problems, you will receive a notification here.

Enable Authentication From The Server and Client Side

  • Step :1Log in to your Plesk control panel and go to the Tools & Settings option. Then, select Mail server settings.
  • Step :2Choose Relay Options and select Enable SMTP services.
  • Step :3In Web Host Manager, SMTP is disabled by default. To fix this issue, navigate to WHM and select Service Configuration.
  • 535 Incorrect Authentication Data
  • Step :4Then, select Service Manager and choose the Antirelayd checkbox.

Steps To Repair Mailbox Permission

In case the issue has occurred due to a change in your mailbox permission due to migration, you can fix the problem by repairing the mailbox permissions. Follow these instructions for the detailed steps.

  • Step :1Web Host Manager can automatically check your server’s mail system and repair the discrepancies.
  • Step :2To repair the mailbox permission, go to your Control Panel and select Email followed by Repair Mailbox permissions.
  • Steps To Repair Mailbox Permission
  • Step :3Finally, click the Proceed button.
  • Step :4Now, check whether you have fixed the error code.

In this article, we have explained the possible causes and the appropriate solutions to fix the “535 incorrect authentication data” issue on your own. If you still cannot resolve this error code, you can reach out to us for technical assistance.

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