Send a template email in SendGrid when a contact joins a list in Brevo

What each client fills in

SendGrid: From address

For example hello@northside.example

SendGrid: Template ID

Email API → Dynamic Templates → the template: its ID.

Brevo: List ID

Contacts → Lists: the number beside the list’s name.

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.

• Brevo

  In the client’s Brevo: account menu → SMTP & API → API Keys → Generate a new API key.

• 

  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 Brevo, for “A contact joins a list”
2. Connect the client’s SendGrid, for “Send a template email”
3. Fill in Brevo: List ID (Contacts → Lists: the number beside the list’s name)
4. Fill in SendGrid: From address (For example hello@northside.example)
5. Fill in SendGrid: Template ID (Email API → Dynamic Templates → the template: its ID)