For instance, you may want to move mail sent to your Leland email address into an inbox separate from your CMGM account inbox (instructions for configuring Eudora to read email from secondary accounts are located here).

Select "Make Filter" from the "Special" menu in Eudora. A window with the following options will appear:

I usually leave this option enabled. Otherwise, if Eudora filters incoming messages, the new messages will be moved to folders other than the "Inbox", where I am accustomed to seeing new mail.

Outgoing filters only apply to email you send, forward, or reply to.

You can tell Eudora to filter mail by sender address, recipient address, or subject. Specify the "Subject" or "From contains" fields and specify the folder to transfer the qualifying email to under the "Action:" section of the window. You can transfer messages to a new mailbox, to an existing mailbox, or directly to the trash, unread.

It's a good idea to give a complete email address in the "From contains" field. If you specify something like "cmgm.stanford.edu" in the "From contains" field, everyone who sends you email from their CMGM account will be filtered to a folder of your choice.

To filter your Leland messages, set the "Any Recipient contains" field to your Leland email address.

Note that the Filters do not have any boolean capabilities; that is, you cannot specify within this single window for Eudora to filter messages from "someone" with this "subject" (either filter by "someone" or by "subject").