Order should be from beginning to end, of course!

Maybe hg import should be able to import more than one patch at once.
Walking through all attachments of all messages in an mbox file?
For multiple messages: How should the order be determined?

works in main, tested with a base64 encoded attached patch

Python has an excellent email package that we could be using to safely pull one
or more patches out of email messages or mbox files.

This would be really nice to have, particularly in the case of MIME-encoded
messages that turn "=" into "=3D", and the like.