Add bag full mailbox mailing flow

MailboxCourier/README.md

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+# MailboxCourier
+
+Wrath 3.3.5 addon for testing mailbox batch sending.
+
+## Install
+
+Copy the `MailboxCourier` folder into:
+
+```text
+World of Warcraft/Interface/AddOns/
+```
+
+Then reload UI or restart the game.
+
+## Use
+
+1. Open a mailbox.
+2. Set recipient:
+
+```text
+/mc to CharacterName
+```
+
+3. Send eligible bag items:
+
+```text
+/mc send
+```
+
+Useful commands:
+
+```text
+/mc
+/mc stop
+/mc subject Auto mail
+/mc dryrun on
+/mc dryrun off
+/mc black add 6948
+/mc black del 6948
+```
+
+The addon skips soulbound items, quest items, containers, locked items, and blacklisted item IDs. Hearthstone item ID `6948` and Skinning Knife item ID `7005` are blacklisted by default.