The Header and Envelope rewrite mini-HOWTO explains how to rewrite your from address differently in the mail header and the mail envelope. This may be necessary, for example, if your ISP requires you to send mail with one address, but you are subscribed to mailing lists with a different address, or want others to see a forwarding address instead of your ISP's address.
swpartc is a simple but reliable utility for copying the data contents of one file or partition into another one and vice versa without losing a bit. The partitions must have the same size. It uses a crash recovery technique (a small back-up file), which means that even if the process is killed or the computer crashes, the user can safely resume the swapping operation later.