Migrate from Mailchimp to HubSpot

Mailchimp subscribers map directly to HubSpot contacts by email address as the primary deduplication key. All subscriber records are matched against existing HubSpot contacts using email; duplicates are merged rather than created. Subscribers without a valid email address are flagged in a quarantine list for manual review before migration to prevent data integrity issues.

Mailchimp audiences have no direct HubSpot equivalent since HubSpot maintains one unified contact database. We create a HubSpot list for each Mailchimp audience and add a custom boolean property (Audience_Name__c) set to true for members. Subscribers appearing in multiple Mailchimp audiences receive all corresponding audience properties, preserving the complete membership history.

Standard Mailchimp merge fields (FNAME, LNAME, PHONE, ADDRESS) map to HubSpot native contact properties using the standard field names. Custom merge fields created per audience are migrated as HubSpot custom properties, preserving the original data type — text fields become single-line text properties, number merges become number properties, and date fields become date properties in HubSpot.

Mailchimp tags are cross-audience labels attached to subscribers without hierarchical structure. We map tags to HubSpot contact properties by default, using a multi-select property or multiple single-select boolean properties depending on tag count. Alternatively, tags can map to HubSpot lists if the tag functions as a segment equivalent for dynamic list membership. The strategy is chosen during the planning phase.

Mailchimp groups are interest-based categories within an audience that allow subscribers to self-select preferences such as product interest, subscription tier, or communication frequency. Each group maps to a dedicated HubSpot contact property named by group category, with the group name preserved exactly as the option label. Group categories define the property API name while group names become the selectable options.

Mailchimp maintains detailed engagement records per subscriber including opens, clicks, and sends for each campaign in the send history. HubSpot's native timeline only tracks engagement with emails sent from HubSpot itself. Historical Mailchimp campaign metrics are migrated as static custom properties on each contact, including Last_Mailchimp_Campaign_Date__c, Mailchimp_Open_Count__c, and Mailchimp_Click_Count__c for reporting continuity.

Mailchimp automation workflows including welcome series, post-purchase emails, abandoned cart sequences, and birthday automations have no native HubSpot equivalent due to architectural differences in trigger models and enrollment logic. We export full automation definitions as JSON including every trigger, condition, delay, and action step. Your HubSpot admin receives a step-by-step reference document for manual rebuild using HubSpot Workflows.

Mailchimp email templates are stored in Mailchimp's proprietary template format and content studio, which cannot be imported directly into HubSpot's email editor. We export template content as HTML files and capture reference screenshots for each template. Your team uses these exports to manually recreate templates in HubSpot's drag-and-drop email builder, preserving the visual layout and content structure.

Mailchimp segments are dynamic filters applied to audience members based on engagement data, tag assignments, or merge-field values. Static segments map directly to HubSpot static lists containing the same contacts. Dynamic segments that rely on opens, clicks, or tag criteria must be rebuilt as HubSpot Smart Lists using HubSpot's filter conditions, property names, and operators which differ from Mailchimp's segment syntax.

Aggregate campaign metrics including total sends, opens, clicks, unsubscribes, and bounce rates per campaign do not map to any native HubSpot object. We create a Mailchimp_Campaign_Report__c custom object in HubSpot and populate it with these aggregate statistics as separate fields. This preserves campaign-level historical data alongside the per-contact engagement properties for complete reporting coverage.

Mailchimp tracks individual engagement events per subscriber across all campaigns, recording each open and click with timestamps. HubSpot's activity timeline only captures interactions with HubSpot-sent emails and forms. We aggregate the historical Mailchimp engagement data as custom number fields on each contact, including total opens and total clicks, enabling historical reporting within HubSpot's native reporting tools.

Mailchimp subscriber statuses map directly to HubSpot contact email subscription statuses: 'Subscribed' becomes 'subscribed', 'Unsubscribed' becomes 'unsubscribed', and 'Cleaned' (hard bounce) becomes 'bounced' with a custom Mailchimp_Cleaned__c boolean flag set to true. This flag distinguishes hard bounces from manual unsubscribes, which is important for compliance and re-engagement campaign planning.