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535 incorrect authentication data error normally occurs due to wrong permissions.
For fixing mail box permissions from WHM,
1)> Log on to WHM as root. Then click on “Email” section.
2)> Choose “Repair Mailbox permissions”
3)> It will display the below message,
This function will inspect mailbox ownership and permissions and attempt to
fix any issues that may exist.
Click on “Proceed ”
This will fix permission issues in mail box
Need our help to fix the issue ? Submit Support Ticket Now
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