Start talking about Maildir. It makes sense

DESIGN.md

@@ -13,13 +13,15 @@ We need:
   * Serve autodiscovery bumpf
   * ActiveSync protocol
 * Storage
+  * Give it a home directory. Stores Maildirs + settings DB + TLS
   * Accounts
     * Passwords!
     * Emails
   * TLS keys + certificates
-  * Search emails - some sort of inverted index necessary
+  * Emails go into Maildirs
+  * Search emails - some sort of inverted index necessary. One per maildir?
     * https://github.com/blevesearch/bleve ?
-  * Embedded database best. Ideally we have a single file to work with
+  * Settings DB should be a simple K-V store for accounts, passwords, etc. BoltDB?
     * https://github.com/coreos/bbolt
     * https://github.com/asdine/storm
 
@@ -52,3 +54,5 @@ The message body is being stored inefficiently (json []byte, so base64-encoded)
 
 Message username and mailbox are indexed, but is that good enough? Perhaps we
 should have a bucket per mailbox or something?
+
+TODO: rewrite this (and the code) to make Maildir into a thing