Migrate from Market Maker to Mailchimp

Pipeline and deal data have no native Mailchimp home — tagging schema requires upfront planning

Market Maker deals, pipeline stages, and deal amounts have no direct equivalent in Mailchimp's object model. Mailchimp has no deal object, no pipeline view, and no stage probability tracking. We translate deal names and stages into subscriber tags and custom merge fields, but this requires deciding on a tagging taxonomy before migration runs — for example, whether to use one interest group with stages as values or separate tags per stage per pipeline. Teams that skip this planning step end up with inconsistent tagging that breaks segmentation post-migration. We deliver a tagging plan during discovery so the schema is locked before data lands in Mailchimp.

Mailchimp merge fields cap at 255 characters — long-text CRM fields require truncation or splitting

Market Maker custom properties and notes can contain long text values with no character limit. Mailchimp merge fields (the equivalent of custom fields) are capped at 255 characters. We flag any Market Maker field exceeding this limit during the data audit and apply a truncation strategy: long notes are cut to 255 characters with a reference back to the source Market Maker record ID, and long-text custom properties are split across two or more merge fields with a naming convention like PROPERTY_NAME and PROPERTY_NAME_2. This is handled automatically, but the truncated output should be verified in the sample migration before the full run.

Unsubscribe and cleaned-contact compliance status must be managed before import or contacts will be skipped

Market Maker contacts who have unsubscribed or been marked as cleaned cannot be re-imported into Mailchimp as active subscribers. Mailchimp's platform enforces suppression at the email address level — if a contact appears on the unsubscribed or cleaned list, the import skips that record silently. We extract Market Maker's unsubscribe and cleaned-contact lists separately and manage them as Mailchimp suppression lists pre-import, ensuring that compliance status is preserved and no active subscribers are accidentally skipped during the bulk import run.

Mailchimp's default import deduplication can create duplicate contacts if owner email matching is not configured

Mailchimp's import tool deduplicates contacts by email address by default — if two Market Maker records share the same email but have different owner assignments or deal histories, the import merges them into a single Mailchimp subscriber. This is correct behavior for most cases, but it means the second record's CRM_OWNER and DEAL_TAG values are lost. We enable email-based deduplication with a pre-import sort rule that keeps the most-recently-modified Market Maker record when duplicates are detected, and we log duplicate merges for your team to review post-migration.

CRM owner assignment has no Mailchimp equivalent — owner data must be explicitly preserved as a custom field

Market Maker assigns every record to a named owner (a user in the CRM). Mailchimp has no concept of record ownership — subscribers belong to an audience, not to individual users, and there is no owner field on a Mailchimp subscriber record. If your team relies on owner assignment to route follow-ups or filter reports, that information disappears unless we capture it explicitly. We create a CRM_OWNER merge field and populate it with the owner's email address from Market Maker so your team can still segment by source-system owner in Mailchimp reports, though the assignment does not create any automated routing logic.