what is the different between POP3 and IMAP?

* POP 3

POP3 works by reviewing the inbox on the mail server, and downloading the new messages to your

computer.

You only check e-mail from one computer.

You want to remove your e-mail from the mail server.

Set to remove mail from server after 30 days.

Don't check more frequently than every 15 minutes.

75 MB is the maximum for POP3 users. POP’ing large mail boxes consume excessive server

resources.

* IMAP

IMAP downloads the headers of the new messages on the server, then retrieves the message you want to read when you click on it.

You check e-mail from multiple locations.

You use Web mail.

Do NOT check all folders for new messages! This slows your e-mail substantially.

Use "mail/" (without the quotes) as your IMAP folder directory.

You can set your client to download the mail and to remove the mail from the server, like a POP3

client.