Mailchimp Integration: Sync OctopusPro Mailing Lists for Email Marketing

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Mailchimp Mailing Lists Integration

OctopusPro’s Mailchimp integration lets you sync your OctopusPro mailing lists to Mailchimp so you can run professional email marketing campaigns, build automations, segment your audience, and track results—using the same customer contacts you manage in OctopusPro.

OctopusPro and Mailchimp integration overview

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What this integration is for

Mailchimp is an email marketing platform designed for sending newsletters, promotional campaigns, and automated email journeys. By connecting OctopusPro to Mailchimp, you can:

  • Use your OctopusPro mailing lists as your marketing audience in Mailchimp
  • Send targeted campaigns (e.g., promotions, announcements, follow-ups)
  • Build automations (e.g., welcome series, re-engagement sequences)
  • Measure performance (opens, clicks, unsubscribes) and optimize your messaging

Note: Mailchimp typically refers to “lists” as an Audience. In this guide, “mailing list” refers to your list in OctopusPro that you sync to Mailchimp.

What data is synced

When you sync a mailing list, OctopusPro sends the subscriber email addresses from that list to Mailchimp (and any basic contact details that are included for those subscribers, where applicable). Mailchimp then manages marketing states such as unsubscribed, bounced, and suppressed contacts.

Important: If someone unsubscribes in Mailchimp, you generally can’t email them again via Mailchimp unless they opt in again.

Before you start

  • Mailchimp account: You need an active Mailchimp account.
  • OctopusPro mailing list: Make sure you’ve created at least one mailing list in OctopusPro containing the contacts you want to market to.
  • Permissions: You’ll need admin/manager access in OctopusPro to manage integrations.
  • Consent & compliance: Only email contacts who have given marketing permission (and follow your local email marketing requirements).

Connect OctopusPro to Mailchimp (API key)

Step 1: Create (or log in to) your Mailchimp account

If you don’t have a Mailchimp account, create one here: https://login.mailchimp.com/signup/

Mailchimp signup screen

Step 2: Generate a Mailchimp API key

To connect OctopusPro to Mailchimp, you’ll need a Mailchimp API key. Generate one by following Mailchimp’s guide here:

https://mailchimp.com/help/about-api-keys/

Security tip: Treat your API key like a password. Store it securely and rotate it if you suspect it was exposed.

Step 3: Add the API key to OctopusPro
  1. Log in to your OctopusPro account.
  2. Go to Settings > Company Settings > Integrations.
  3. Click New Developer Integrations (API).
  4. Select Mailchimp.
  5. Paste your API key into the Parameter Value field.
  6. Click Save.

Adding the Mailchimp API key in OctopusPro Developer Integrations

Sync an OctopusPro mailing list to Mailchimp

Once the integration is connected, you can sync any OctopusPro mailing list to Mailchimp.

  1. Go to Settings > Communications > Mailing Lists.
  2. You’ll be redirected to the Mailing Lists Settings page. Click Mailing lists.
  3. Locate the mailing list you want to export/sync.
  4. Click Sync emails to Mailchimp next to that list.

Sync emails to Mailchimp button in OctopusPro mailing lists

Tip: Sync again anytime you add new contacts to the mailing list (for example, after importing customers or adding new leads).

Verify the sync in Mailchimp

To confirm the sync worked:

  • Log in to Mailchimp and open your Audience.
  • Check All contacts for newly added/updated contacts.
  • If you use tags/segments in Mailchimp, apply them before sending campaigns for better targeting.

Examples & best practices

Example mailing lists you can create in OctopusPro
  • New leads (last 30 days): Send an introductory offer or helpful onboarding email.
  • Inactive customers: Run a re-engagement campaign with a seasonal promo.
  • VIP customers: Exclusive offers, early access, or referral incentives.
  • Service due soon: Reminder campaign encouraging rebooking (great for recurring services).
Best practices
  • Segment before you send: Smaller, more relevant audiences usually perform better than “send to everyone”.
  • Respect opt-in status: Only email customers who agreed to marketing.
  • Expect de-duplication: Mailchimp typically prevents duplicates based on email address.
  • Track performance: Use Mailchimp analytics to refine subject lines, offers, and timing.

FAQ

Can I sync more than one mailing list?

Yes. You can sync each OctopusPro mailing list individually by clicking Sync emails to Mailchimp next to the relevant list.

How often does OctopusPro sync?

Sync occurs when you click the sync button. If you add more contacts later, sync again to export the latest mailing list members.

Will unsubscribed contacts be re-subscribed?

No. Mailchimp controls subscription status. If someone unsubscribed in Mailchimp, they generally must opt in again to receive marketing emails.

Troubleshooting

“Invalid API key” or connection error
  • Confirm the API key is correct (no extra spaces).
  • If the key was rotated/removed in Mailchimp, generate a new one and update it in OctopusPro.
Mailchimp isn’t available in Integrations
  • Make sure you’re in Settings > Company Settings > Integrations and using New Developer Integrations.
  • Confirm your user role has permission to manage integrations.
Contacts didn’t appear in Mailchimp
  • Confirm the OctopusPro mailing list contains contacts with valid email addresses.
  • Try syncing again after updating the mailing list membership.
  • Check Mailchimp for suppressed/unsubscribed contacts that can’t be mailed.

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