Just like the Windows folders on a PC, the fun you can have deleting files at random to save space.
Bob
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My phone history:
2110 - Bit of a brick
5110 - Face Changer
3210 - My First Games Phone
6210 - Almost Everything I Needed
7650 - Groundbreaking Stuff
If you are looking at your email using the 7650's POP3/IMAP email client, then to delete your email headers from the phone you need to have an empty email server. So either connect to your email server just after you have downloaded it all onto your PC, or when you look at your emails on the phone choose options/delete/from phone and server, when you disconnect the phone will tell the server to delete each email you have told it to from, and your list will gradually dissappear.
The list of email headers on your phone is only a snapshot of the headers when you last connected to your email server.
Does this help?