Managing Mail Between a Desktop and a Laptop?
dotancohen asks: "I'll soon be getting a new Dell laptop that'll be running Fedora Core 5 or 6. I need to access the email stored on my home box from the laptop, and also to read new email sent to me while I'm not home (and the home box is shut down). If I run an IMAP server at home, then I can't read the mail when the home box is down. However, if I pull from the POP3 server (and leave the mail on the server) then I won't be able to sort and file the mail while on the go. I currently use Kmail, but I might switch to Eudora in April/March when it becomes available for Linux. Is there anyway to sync the mail accounts between two Linux boxen, assuming that I'm using the same mail client?"
...is probably what you want - and KMail appears to support it.
Alternatively Thunderbird certainly supports cache'ing a copy of messages for working offline but I'm not sure if it supports the kind of resyncing that you're looking for.