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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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