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Authentication failed :: 535 Incorrect authentication data

One of my client can't send/receive email. The log file shows the following error message:

Message not sent. Server replied:

Authentication failed
535 Incorrect authentication data

How can I fix it?

Make sure that this or any other domain with this problem is NOT in /etc/demodomains file and/or /etc/demousers. Disabled the demo mode from the WHM and you should be good to go.

 
 
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