Keep Mail at the Server for Some Time with Mac OS X Mail

Isn't the Nebra sky disk beautiful? One could hardly guess its age of more than 3500 years. Mac OS X Mail can make sure your mails won't reach this age on the server after you have downloaded them. It lacks all connections to the highly significant description of the forgery of Achilles' shield in Homer's Iliad, book 18, 462, though, which can be read to be description of the sky disk's making.
Have a backup read on the server, read mail at multiple locations, and avoid having your mailbox blocked by old mail. Here's how to do all this and not more in Mac OS X Mail.