User not receiving random emails, and unable to return correct results from searching other emails

User not receiving random emails, and unable to return correct results from searching other emails

Hi Zoho,

- One of my users (Terry) is not not receiving random emails in his inbox (he receives some, but does not receive others).
- Its not in SPAM or Trash, its not being filtered anywhere.
- I have done an email recovery for a specific email on a certain day and made sure it wasn't deleted.
- Upon viewing the admin logs, it says its been delivered to him....but its not there.

ALSO 
- When this user searches for an email, it does not return the correct results.
- We looked at his inbox, and then searched for various things from the top 5 emails.
- We tried searching Sender, Contains, Emails TO: the user.
- They either returned nothing or 1-2 emails......