HubSpot + Mailchimp

HubSpot + Mailchimp Integration - Save 8+ hours/week Every Week

Australian Professional Services businesses rely on both HubSpot and Mailchimp. Our custom one-way integration keeps them in sync, saving your team 8+ hours/week and eliminating data entry errors.

8+ hours/week

Saved weekly

Mailchimp fields

2 weeks

Setup time

One-way

Sync direction

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Why Connect HubSpot to Mailchimp?

Contacts in HubSpot and contacts in Mailchimp drift out of sync, leading to outdated details on invoices, emails, and reports

Mailchimp adds complexity: the platform tries to be an all-in-one marketing tool, but the website builder, social posting, and CRM features feel bolted on rather than integrated

Online orders in HubSpot and in-store inventory in Mailchimp are never in sync, frustrating customers

Reporting across HubSpot and Mailchimp requires painful manual exports and spreadsheet merges

New team members take longer to onboard because they must learn manual workarounds to keep HubSpot and Mailchimp aligned

No single source of truth when contacts live in two disconnected tools, so staff second-guess which system has the correct information

How We Help

HubSpot offers a native Mailchimp integration in its App Marketplace. The native sync handles basic contact push from HubSpot to Mailchimp but does not pull engagement data back or sync unsubscribes from Mailchimp to HubSpot. For bi-directional sync and engagement tracking, use a Make or Zapier workflow. API rate limits: Mailchimp allows 10 concurrent connections and a maximum of 10 requests per second. Batch operations (lists/members endpoint) support up to 500 members per request. HubSpot allows 100 requests per 10 seconds. Key gotcha: Mailchimp audience member lookup requires the MD5 hash of the lowercase email, not the email itself. Mailchimp merge fields must be pre-created in the audience settings before you can write to them via API. The Mailchimp API returns paginated results (max 1,000 per page), so large audience syncs require pagination handling. Be aware of SPAM Act (Australian anti-spam legislation) requirements: both systems must respect unsubscribes, and the sync must not re-subscribe contacts who have opted out.

Amplify HubSpot Strengths

HubSpot excels because free tier includes contact management, deal tracking, and email templates - genuinely useful without paying a cent. Connecting it to Mailchimp ensures that advantage flows through your entire workflow rather than staying siloed in one tool.

Eliminate Manual Data Entry

Stop copying contacts between HubSpot and Mailchimp by hand. Our integration syncs data automatically, saving your team 8+ hours/week.

Unlock Mailchimp Value

Mailchimp stands out because generous free plan supports up to 500 contacts with email campaigns, landing pages, and basic automations - a genuine starting point for small businesses. Integrating it with HubSpot means your team gets this benefit with complete, accurate data flowing in automatically.

Built-In Error Handling and Alerts

Our integrations include automatic retries, error queuing, and real-time notifications. If something fails between HubSpot and Mailchimp, your team knows immediately and the system self-recovers where possible.

HubSpot to Mailchimp Use Cases

Sync HubSpot contacts to Mailchimp audiences

Automatically add new HubSpot contacts to a Mailchimp audience for email marketing. Segment by HubSpot lifecycle stage so marketing can target leads, MQLs, and customers with different campaigns.

Sync Mailchimp campaign engagement back to HubSpot

Push Mailchimp email open, click, and unsubscribe data back to HubSpot contact records. Enables sales reps to see which emails a prospect engaged with directly in the CRM.

Honour unsubscribes across both platforms

When a contact unsubscribes in Mailchimp, update their HubSpot communication preferences to prevent email sends from HubSpot. Ensures SPAM Act compliance across both systems.

Data Mapping

How data flows between HubSpot and Mailchimp

HubSpot	→	Mailchimp	Notes
HubSpot Contact → Email	→	Mailchimp Member → email_address	Mailchimp uses MD5-hashed lowercase email as the subscriber ID for API calls.
HubSpot Contact → First Name	→	Mailchimp Member → merge_fields.FNAME	Merge fields must be created in Mailchimp audience settings first.
HubSpot Contact → Last Name	→	Mailchimp Member → merge_fields.LNAME	Standard Mailchimp merge field.
HubSpot Contact → Lifecycle Stage	→	Mailchimp Member → tags[]	Map HubSpot lifecycle stages (subscriber, lead, mql, customer, etc.) to Mailchimp tags for segmentation.
HubSpot Contact → Company Name	→	Mailchimp Member → merge_fields.COMPANY	Custom merge field. Must be created in Mailchimp before syncing.
Mailchimp Member → status	→	HubSpot Contact → Email Subscription Status	Mailchimp statuses: subscribed, unsubscribed, cleaned, pending. Map to HubSpot opt-in/opt-out.
Mailchimp Campaign Activity → opens / clicks	→	HubSpot Contact → Custom Properties	Aggregate engagement data for CRM visibility.

HubSpot + Mailchimp Integration FAQ

Absolutely. We design integrations with growth in mind, whether you are syncing 100 records or 100,000. Our architecture handles rate limiting (HubSpot's API allows 100 requests per 10 seconds (OAuth) or 150 requests per 10 seconds (private apps)), pagination, and queuing to ensure reliable performance at any scale.

Yes. We have built integrations for Professional Services businesses that rely on both HubSpot and Mailchimp. The integration is customised to your industry-specific workflows, data structures, and compliance requirements. Book Free Assessment to discuss your specific needs.

We follow a structured testing process: unit tests for individual data mappings, end-to-end tests with sample data, and a staging period where we run the integration in parallel with your existing process. You review and approve the results before we switch to live. This approach minimises risk and ensures accuracy.

Typical crm & sales data synced includes contacts, campaigns, and related metadata. We map each field to its counterpart in Mailchimp and handle any format differences automatically.

We use a combination of direct REST API connections and automation platforms like Make, Zapier, or n8n, depending on your requirements and budget. For complex workflows, we build custom middleware. The right approach depends on your volume, sync frequency, and business rules.

Yes. Clever Ops has helped Retail & E-commerce businesses connect HubSpot to Mailchimp as part of their automation strategy. Each industry has unique data flows and compliance needs, and we tailor the integration accordingly. Based in Gippsland, Victoria, we understand the Australian market deeply.

The most common data objects synced between HubSpot and Mailchimp include contacts, campaigns. We map each data type to its counterpart in the target system, including custom fields, metadata, and relationship data. The exact scope is tailored to your workflow during the discovery session.