What does 535 Incorrect Authentication Data mean?
This error is commonly seen with mailbox file permissions in cPanel. Root access is required to correct this issue. If receiving this error and you are a Shared or Reseller customer, please contact us for further assistance.
Users with root access can fix this problem in root WHM by doing to the following:
- In WHM, locate the Email section in the left-side panel.
- Select Repair Mailbox permissions.
- Click Proceed.