Problem with mail removing POP3 messages regardless of setting

Problem with mail removing POP3 messages regardless of setting

The mail application is removing messages from my POP3 server regardless of the option I set in ZOHO.  This problem just started over the past week or so. 

I recently notice that I was missing email messages on my PC but was finding the missing messages in ZOHO.  Upon closer inspection if I do not check for messages with my PC that over a period of time I will not receive any messages on the PC.

When I check the POP3 server the messages are gone but they are setting in ZOHO.

I have tried all of the different settings in ZOHO mail for "leave the messages" " only delete if deleted in ZOHO", "Delete on after number of days".  No matter what the settings the messages still get removed from the POP3 server after ZOHO performs a retrieve.

I do integrate ZOHO mail with ZOHO CRM.

Thanks in advance for you suggestions.

Keith