Strange Junk email issue

[nitaish]

I am managing a customer's cPanel server. He has a domain configured with lots of email users created. He is facing a weird issue which I am unable to resolve. All the emails sent from a user (say [email protected]) to another user ([email protected]) are landing in the junk folder of [email protected]. There is no system level, domain level or user level filter created either through cPanel or through any webmail. Even the email headers and the log files don't reveal anything. Can somebody help me to find out the cause and the solution?

 

[cPanelMichael]

Hello

Could you post the entry from /var/log/exim_mainlog for one of these messages? Here's a command you can use to generate log entries for a specific email address:

exigrep [email protected] /var/log/exim_mainlog

Thank you.