I am new to Zoho mail. I use Zoho webmail, the Android phone app and also download mail on my laptop to Microsoft Outlook 2007 (using POP settings but leaving mail on the server until it is deleted in Outlook or one of the other apps.)  I've only used this service for a couple of weeks but I have noticed that periodically I get duplicate emails in my Inbox.  The duplicates show up on all three apps.  At first the duplicates were emails that I had sent to myself, either from my old email account but sometimes from my own zoho account.  (This was when I was testing the service.)  Since I started sending out my new email address to various other people, I've had duplicates from eBay and from Amazon, though not all of the emails from either place have been duplicated.  It is a minor hassle to just delete the duplicate email, but I'd rather stop it altogether.  Please let me know what I can do to troubleshoot this issue.