Send an email in SendGrid when a message is posted in a channel in Slack

What each client fills in

SendGrid: From address

For example hello@northside.example

Who it goes to (SendGrid)

The address that gets it: yours, or the client’s team.

Slack: Channel ID

The channel’s details → About: the ID at the bottom.

The accounts it needs

Each is the client’s own, stored encrypted and never copied between clients. Until one is added the client’s checklist shows it, and nothing runs.

• 

  In the client’s Slack: api.slack.com/apps → Create New App → OAuth & Permissions → add the chat:write scope (and channels:history, plus groups:history for a private channel, for the message trigger) → Install to Workspace → copy the Bot User OAuth Token. Invite the app to the channel.

• 

  SendGrid → Settings → API Keys → Create API Key with Mail Send access; for the triggers, also the Event Webhook settings permission (user.webhooks.event.settings.read and user.webhooks.event.settings.update), or Full Access. The From address must be a verified sender.

After you install it

It lands switched off. The client’s checklist holds exactly this:

1. Connect the client’s Slack, for “A message is posted in a channel”
2. Connect the client’s SendGrid, for “Send an email”
3. Fill in Slack: Channel ID (The channel’s details → About: the ID at the bottom)
4. Fill in SendGrid: From address (For example hello@northside.example)
5. Fill in Who it goes to (SendGrid) (The address that gets it: yours, or the client’s team)