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+## UI
+* [x] List `mailboxes` all in the `Email Provider`, identifying those *registered* locally.
+* [x] Select which to *register* or unregister for watching.
+* [x] List *registered* `mailboxes`.
+* [x] List `messages` for selected `mailbox`.
+* [ ] Schedule `attachments` downloads.
+* [ ] Download `attachments` (*encrypted* & *decrypted*).
+
+## CLI
+* [x] Get `mailboxes` from **[API]** then run `grab messages` job in **[API]** for each one.
+* [x] Get `pending attachments` jobs from **[API]** and run.
+
+## API
+* [x] Grab all `mailboxes` from `Email Provider`, identifying those that are registered.
+* [x] Register `mailboxes` into **[database]**.
+* [x] Grab new `messages` from `Email Provider` for selected `mailboxes` and store them in the `database`.
+* [x] Grab `messages` from **[database]** for selected `mailboxes`.
+* [ ] Grab `attachments` from `Email Provider` for selected `messages`.
+* [ ] Decrypt `attachments`.
+* [ ] Register `messages` for `attachment` job.
+
+
+## Workflow
+* **[User]** Choose `mailboxes` to register or unregister
+    -> **[API]** Register selected `mailboxes` and get `messages` for recently registered.
+* **[Cron]** Get registered `mailboxes` -> **[API]** Get `messages`
+* **[User]** Check messages found -> **[API]** Schedule `attachments`
+* **[Cron]** Get `attachment download` jobs -> **[API]** grab `attachments`
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