> Post to Slack when someone subscribes or unsubscribes in a Mailchimp audience, or when a buyer is added to it. Native Plandalf steps, no Zapier needed. Source: https://plandalf.com/apps/mailchimp/integrations/slack Last modified: 2026-10-26 Native integration # Mailchimp + Slack integration Slack hears about Mailchimp subscribes, unsubscribes and new buyers, and Mailchimp is updated from the same sequence. [Start your 14-day free trial](https://admin.plandalf.dev/signup)[Jump to the setup](#setup) No credit card required. No coding required. **Mailchimp** **Slack** ## Does Mailchimp integrate with Slack? Mailchimp does not post to Slack through Plandalf by itself. Plandalf has native steps for both: Contact Subscribed and Contact Unsubscribed triggers can start a sequence that runs Send Slack Message, and a paid-checkout sequence can add the buyer in Mailchimp and post to a channel. Connect both under Automation, Marketplace. ## What moves between Mailchimp and Slack Event From and to Through What happens Contact subscribed MailchimpSlack Native step Plandalf adds the audience webhook when you save the trigger. The sequence posts the contact's `email` and `first_name` to a channel. Contact unsubscribed MailchimpSlack Native step This trigger also gives the `reason` and `unsubscribe_action` Mailchimp reports, which suit a message to the team that owns list health. Checkout completed PlandalfMailchimp Native step Add Tags to Contact or Add or Update Contact puts the buyer in the audience. Record Event starts a Customer Journey. Checkout completed PlandalfSlack Native step The Slack notifications recipe covers new purchase, invoice paid, refund and upsell accepted, each with its own channel. Invoice refunded StripeMailchimp Native step The refund template removes the buyer's tags in the audience you pick, while a separate Slack refund notification posts the amount. ## Alert Slack on audience changes and sales You need a Mailchimp API key with its data-centre suffix and permission to approve Plandalf in your Slack workspace. 1. ### Connect Mailchimp In Automation, Marketplace choose Mailchimp and paste the whole key from Extras, API keys. A key missing the part after the dash is refused. 2. ### Connect Slack Choose Slack, Add to Slack, check the workspace named in the corner and click Allow. Add the app to any private channel you want to use. 3. ### Create an unsubscribe alert Start a sequence with Mailchimp, Contact Unsubscribed and pick the Audience. Add Slack, Send Slack Message to a list-health channel with the email and reason. 4. ### Turn on the sale recipe Under Automation, Templates open Slack notifications, switch on New purchase, pick the channel and save. Those notifications are managed for you and do not appear in My Sequences. 5. ### Tag the buyer In a Checkout Completed sequence add Mailchimp, Add Tags to Contact with the audience and the tag. Keep Status for New Contacts on the choice that matches the consent you collected. 6. ### Test with a test contact A step test changes the real audience and posts to the real channel. Use your own email, then switch on Run on test purchases only when you want a full run. ## What sellers do with Mailchimp and Slack ### Newsletter owner watching churn Every unsubscribe posts to a Slack channel with the reason, so patterns after a particular campaign are easy to spot. ### Shop team watching launches On launch day the team keeps one channel for purchases and another for new subscribers, both fed from Plandalf sequences. ## Limits and gotchas - Mailchimp triggers fire whoever made the change, including Plandalf. A sequence that adds buyers to the audience also raises Contact Subscribed on it. - Mailchimp allows 10 simultaneous connections per API key. A rate-limited step is retried twice. - Voided invoices do not post through the Slack notifications recipe, and its Refund event posts for partial refunds too. - If Slack answers with `not_in_channel` or `channel_not_found`, the private channel is missing the app or the channel is gone. - Mailchimp events carry no revenue and purchases are not sent to its ecommerce API, so the amount is easiest to see in the Slack post. ## Mailchimp and Slack: common questions Does Mailchimp integrate with Slack? Plandalf connects them through sequences. A Mailchimp subscribe or unsubscribe can start a Slack post, and a paid checkout can run Mailchimp and Slack steps. Check Mailchimp's own integrations for a direct link. How do I get a Slack notification when someone unsubscribes from Mailchimp? Use Contact Unsubscribed as the trigger, pick the Audience, and add Send Slack Message. Plandalf sets up the audience webhook. Can Slack report a failed Mailchimp step? Yes. Switch on Post automation failures to Slack on the Slack connection. Alerts go out at most once every 15 minutes per sequence. Mailchimp Slack integration: will new buyers trigger my subscribe alert? Yes, if they are added as new subscribers to the same audience, because the trigger fires for changes by Plandalf too. ## Guides for this pair - [Plandalf with Mailchimp](https://plandalf.com/platforms/mailchimp) - [Plandalf with Slack](https://plandalf.com/platforms/slack) - [Mailchimp setup](https://plandalf.com/docs/integrations/mailchimp) - [Slack setup](https://plandalf.com/docs/integrations/slack) - [Automations overview](https://plandalf.com/docs/integrations/plandalf) [Start your 14-day free trial](https://admin.plandalf.dev/signup) ## More from Mailchimp and Slack - [**Mailchimp + Drip**Mailchimp and Drip both have built-in Plandalf steps, so one checkout can fill both while you move your automations across.](https://plandalf.com/apps/mailchimp/integrations/drip) - [**Mailchimp + Flodesk**Tag the buyer in Mailchimp with a native step and put them in a Flodesk segment with a Send Webhook call, from the same checkout.](https://plandalf.com/apps/mailchimp/integrations/flodesk) - [**Mailchimp + HubSpot**Mailchimp keeps the newsletter, HubSpot keeps the sales record, and a Plandalf checkout can write the buyer to both.](https://plandalf.com/apps/mailchimp/integrations/hubspot) - [**Stripe + Slack**Your team sees each Stripe sale, renewal, upsell and refund in a Slack channel, and failed automations are reported there as well.](https://plandalf.com/apps/stripe/integrations/slack) - [**Kit (ConvertKit) + Slack**Tell your team in Slack when a buyer is tagged in Kit, or when a Kit tag or form signup happens.](https://plandalf.com/apps/convertkit/integrations/slack) - [**PayPal + Slack**Sales paid by PayPal on a Plandalf checkout can post to a Slack channel, so your team sees each order as it lands.](https://plandalf.com/apps/paypal/integrations/slack) Checked October 26, 2026 against Plandalf's own setup guides.