Feature request: Maildir support

[hightowe]

I saw that mbox support was recently added, which is great as I have a couple of decades of emails stored in mbox format, but I also have at least that much or more email stored in Maildir format: https://en.wikipedia.org/wiki/Maildir

One of these libraries may be helpful:

• https://pkg.go.dev/github.com/emersion/go-maildir
  • https://github.com/emersion/go-maildir
• https://github.com/amalfra/maildir

And just in case it helps as your planning the future of mbox support, FYI: https://pkg.go.dev/github.com/emersion/go-mbox