I like to read my mail on my phone and download it to my computer. When I open my mail on the computer, it downloads everything from the server and then the phone deletes it.
I had the same problem with the mail app that came with the phone, so I got aqua mail and find it does the same thing.
I have pop3 mail, my own mail server. I need the emails to stay on my phone because they have info I need to refer to on the go.
Thanks,
Gina