- Outbox (/mail → Sent Mail button) — read-only view of everything you've sent, shows delivery status for each.
- Cooldown system — configurable anti-spam delay on /mail send, bypassable via smartmail.cooldown.bypass
- Attachment blacklist/whitelist — block or restrict specific items from being sent as attachments.
- Disable in worlds — block mail sending entirely in listed worlds (e.g. minigame arenas)
- Inbox limit — caps how much mail a player can receive; blocks new mail (with item returned) once full.
- Hex color support — &#RRGGBB now works everywhere alongside legacy & codes.
- /mail broadcast <message> — admin command, mails every online player at once.
- Discord Webhook — simple posts a notification every time mail is sent.
- PlaceholderAPI — %smartmail_unread%, %smartmail_total%, %smartmail_sent%
