Send Kit Welcome Emails via Gmail + Slack (n8n Webhook)

Welcome new paid subscribers in seconds—via Gmail and a Slack ping (n8n Webhook)

This n8n workflow automatically sends a personalized welcome email the moment someone confirms their subscription in Kit, using your own Gmail. It then tags the subscriber in Kit and notifies your team in Slack when your list grows.

What this workflow does

• Listens for Kit subscription confirmations: Kit calls the workflow webhook on the subscriber.subscriber_activate event (right when the subscriber confirms).
• Extracts subscriber details safely: a Code node pulls first_name and email from Kit’s payload and fails loudly if the request doesn’t come from Kit.
• Sends a Gmail welcome email: the workflow delivers your welcome message from your own mailbox, personalized with the subscriber’s first name so replies go to you.
• Tags them in Kit: it uses Kit’s v4 API to apply the tag "welcomed", enabling later segmentation.
• Alerts you in Slack: a Slack message informs you that a new subscriber has joined.
• Registers the webhook automatically: a separate manual branch registers the webhook with Kit once—so you don’t need to use curl or the Kit API console.

Use cases

• SaaS onboarding: welcome paid customers immediately after confirmation.
• Marketing ops: tag “welcomed” subscribers to trigger follow-up sequences later in Kit or elsewhere.
• Team visibility: keep sales/ops updated with a Slack notification for each new confirmed subscriber.

Technical details

• n8n nodes: Code, Webhook, Gmail, HTTP Request, Slack, Manual Trigger, Sticky Note.
• Kit integration: webhook receiver for subscriber.subscriber_activate, then Kit v4 API tag update (tag: welcomed).
• Security: Kit does not sign webhooks—use the long random webhook URL as the authentication secret.
• Gmail personalization: use {{ $json.first_name }} and {{ $json.email }} in your subject/body.
• Kit API auth: create a credential named X-Kit-Api-Key containing your Kit API key (Kit → Settings → Developer) for the tagging/register steps.