I receive roughly 2,000 emails a day, most of which are automated by my site and just filed away for future reference. I use Thunderbird on my desktop to download the emails via POP, and they leave the emails on the server for 3 days. Then I have numerous filters in Thunderbird to move everything around to where they should be. I have my Android mobile and Kindle set to download emails, too, but they both lack decent filters and folder capabilities, so they're basically useless. I have to scan through hundreds of emails to find that one important email that, on my desktop, would have been right on top. I don't think that using IMAP is a solution, because if I understand correctly, the emails would stay on the server indefinitely. Obviously, 60,000 emails in a month would fill up my hard drive unnecessarily, and I suspect that it would get pretty slow over time. In a more ideal world, I would download the emails in Thunderbird, let the filters move everything around, THEN my mobile and Kindle would mirror the Thunderbird Inbox and Sent folders. Can you guys suggest a better solution, either server-side or client-side?