But I can't tell what email app you are using. But in the case of someone else's issue like this we had to have a long chat about how email works. At first they were put off by diving into how POP and IMAP differ and how messages on the server don't always match what you see on the device.
Given that more and more folk don't want to know all this, have we reached the point where email as an app should be removed from devices?
This is happening when I am using samsung galaxy tab 10. I tried deleting email account then starting over but same annoying problem persists.