cPanel Mail Servers

535 Incorrect Authentication Data

535 Incorrect Authentication Data
535 Incorrect Authentication Data

535 Incorrect Authentication Data

You may noticed the error 535 Incorrect Authentication Data while sending emails from your server. It is due to the incorrect mailbox file permissions in cPanel.

Please proceed with the following steps to resolve this issue.

  • In WHM, locate the Email section in the left-side panel.
  • Select Repair Mailbox permissions.
  • Click Proceed.

That’s it!

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