Disappearing emails?

I had a customer sumbit a trouble ticket today, which said her emails disappear after a short while in the inbox.

Details below.

1. It is only this one email on the account. All the other emails created for this account work and keep their emails.

2. Upon sending an email to this account the email stays there for a short while and then mysteriously disappears off the server withing a few hours.

3. All emails within the account disappear, even ones in deleted, replied folders, not just the inbox.

4. The email account is being checked with Horde.

Any ideas as to what could be the problem?

 

 

 

 

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