The idea of the extension was to add attachments to either the recipient, or the sender mail of a powermail form.
Additional to simply adding files this extension replaces placeholders in various ways in the supported filetypes.
It's also possible to name the attachments depending on submitted values.
The extension is tested with TYPO3 4.5 and 4.4 only, but should work with 4.2 and 4.3 as well.
You need the latest powermail 1.6.3 or later to use all features.