Migrate from Vaulta to Mailchimp

Vaulta email case sensitivity causes Mailchimp duplicate and re-subscribe risk

Vaulta stores email addresses with their original casing — [email protected] and [email protected] are distinct records in Vaulta. Mailchimp lowercases all email addresses on ingest. During migration, two Vaulta contacts with mixed-case variants of the same email will both resolve to the same Mailchimp subscriber, creating a duplicate-detection failure. Additionally, if a contact in Vaulta has a mixed-case email that bounced in Mailchimp under its lowercase form, re-importing the Vaulta record may re-subscribe a suppressed address unintentionally. We run a case-normalized deduplication pass against the Vaulta export before any Mailchimp subscriber is created or updated, and we flag suppressed-email collisions before the load commits.

Vaulta multiselect pick-lists truncate to pipe-delimited text in Mailchimp merge fields

Vaulta supports multiselect pick-list fields natively — a contact can have multiple therapy areas, regions, or product types selected simultaneously. Mailchimp merge fields do not support multiselect as a field type; they accept only single-value pick-lists, text, number, date, phone, or URL. When we migrate a Vaulta multiselect field, we concatenate the selected values with pipe delimiters into a single text merge field. This preserves all values but breaks Mailchimp's ability to filter or segment on individual values within the multiselect without additional post-migration processing. We flag every multiselect field in the migration plan and offer a custom tag strategy as an alternative.

Vaulta engagement history is not a native Mailchimp data object

Vaulta records calls, emails, meetings, and notes with original timestamps, owners, and activity types in dedicated activity objects linked to contacts. Mailchimp has no equivalent activity log accessible via API. The Mailchimp contact profile shows campaign-level opens and clicks but does not expose a historical activity timeline for non-campaign events. We handle this gap by converting Vaulta engagement records into Mailchimp tags (vcalls:N, vmeetings:N) and custom merge fields (Vault_Call_History__c, Vault_Email_Activity__c) so the data is present on the subscriber record. However, Mailchimp's native segmentation cannot use these Vaulta activity values without post-migration tag-segment setup in Mailchimp's Audience interface.

Vaulta suppression data requires separate Mailchimp import to avoid re-subscription risk

Vaulta tracks contact status — subscribed, bounced, unsubscribed — as fields on the contact record and surfaces this in CRM views. Mailchimp maintains suppression lists separately from the main audience. When contacts migrate, their Vaulta suppression status does not automatically write to Mailchimp's suppression list. If a Vaulta contact with bounced-email status is migrated without being added to Mailchimp's suppression list first, sending to that subscriber can reactivate a suppressed address and damage sender reputation. We export Vaulta bounced and unsubscribed contacts separately and import them as suppressed records before the main audience migration runs.

Vaulta workflows and assignment automations do not map to Mailchimp Customer Journeys

Vaulta workflow rules and assignment automations drive contact routing, approval chains, and owner assignment based on field conditions. Mailchimp Customer Journeys are a separate automation layer with trigger-event logic (welcome, abandoned cart, date-based) that does not replicate Vaulta workflow conditions. A Vaulta rule that assigns a contact to a specific owner based on therapy area has no Mailchimp equivalent — owner assignment in Mailchimp is a tag we apply at migration time, not an ongoing automation. All Vaulta workflow logic must be rebuilt manually in Mailchimp's Journey Builder after migration; we provide a Vaulta workflow audit export as a rebuild reference.