Slack

Post messages to Slack channels from email

No coding required. If you have never used an API key before, follow the walkthrough below step by step. Developers can skip to Quick reference at the bottom

Part 1 — Get your API key

Go to api.slack.com/apps and create a new Slack app (From scratch)
Pick a workspace and name the app
OAuth & Permissions → Bot Token Scopes → add chat:write and channels:read
Install the app to your workspace
Copy the Bot User OAuth Token (starts with xoxb-)
Invite the bot to channels you want to post in: /invite @YourApp

Open Slack key page →

The key usually looks like: xoxb-…

Part 2 — Add your connection in Airbox

Dashboard → Connections → + Slack
Paste the xoxb- bot token
Optionally set a default channel (e.g. #general)
Slack is a tool, not the LLM — keep an LLM provider as the inbox default
Open inbox routing (gear icon) and enable Slack under attached tools
Save

Open the dashboard in a new tab if you want to follow along

Part 3 — Route your inbox

Your Airbox address does not use a connection until you attach one:

Select an LLM provider as inbox default
Enable Slack under attached tools
Save

Try it — send an email

Subject: (* @slack post to #general "Standup notes from email" *)

New to commands? See copy-paste examples and the syntax cheat sheet

Quick reference

Dashboard type	slack
Email targets	@slack
Default model	—
Keys	https://api.slack.com/apps

Short checklist

Create a Slack app with chat:write + channels:read bot scopes
Install to workspace and copy xoxb- token
Dashboard → + Slack → paste token → attach to inbox

What you get

Post to channels
List channels
Default channel in connection config

Notes

Uses a bot token via the Slack Web API. Slack's official MCP server is OAuth/user-token only and is not used here.
The bot must be invited to a channel before it can post there.