Nostalgy also lets you create rules that don't run automatically but simply display a suggested action when it finds a match. You can then use a shortcut key to accept the rule's action. This is handy if, say, you want to take a look at a message subject line before it goes to another folder. The rules can include regular expressions such as a message subject including five digits and an optional dash with four more digits (i.e., a zip code), which Thunderbird's built-in filters cannot.

If you're looking specifically for regular-expression filtering capability within Thunderbird, there's an experimental add-on, , that has more-robust rule options. That's more than I need at the moment, although I expect to give it a try at some point. And if you're looking to save time with repetitive answers to the same kinds of e-mail, the has garnered rave reviews.

But if you just want a quick way to copy or move messages around within Thunderbird, take a look at Nostalgy.

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