Using the "Append This Text to the Subject" option in Email Filters makes it easy to automatically direct messages to Evernote. Evernote supports the syntax @notebookname and #tag at the end of a Subject line to automatically add email messages to specific notebooks (or to your default notebook with specific tags.) Using Pobox's filters, you can set up rules to automatically attach those tags to messages by the email address they were sent to, subject content, message content, and more! Both the Append and Prepend filters will continue to try to match other filters, so you can then set up a filter looking for your tags, to automatically direct them on to your private Evernote address.
Check out Evernote's Help for more information on email sytnax, and stay aware of their daily email limits.