A very simple app allowing to send multiple documents from other apps.
Basically, you "open in" or "copy to" Mail Buffer, from a source app. Then you can send buffered documents from Mail Buffer.
Important:
Only "Copy to..." / "Open in..." is supported. Not all apps propose this (but most of the apps dealing with documents will).
Freemium:
The free version is limited up to 2 attachments per mail.
Privacy:
This app does not access your Contacts.