CRM migration
Field-level mapping, validation, and rollback between Fello and Mailchimp. We move data and schema; workflows are rebuilt natively in Mailchimp.
Fello
Source
Mailchimp
Destination
Compatibility
10 of 10
objects map 1:1 between Fello and Mailchimp.
Complexity
BStandard
Timeline
24–48 hours
Overview
Fello stores real estate agents' contact databases with AI-powered lead scores, home-value enrichment data, TCPA consent records, and custom fields organized around listing pipelines. Mailchimp receives contacts as audience members with a merge-field system that maps directly to most Fello properties. We export Fello contacts via the platform's CSV export, map each field to a Mailchimp merge field (creating any missing ones), and import into your Mailchimp audience. Fello's AI lead scores (0–100) land as numeric merge fields for segmentation use. Fello tags migrate as Mailchimp tags with full name preservation. Fello's automations and workflows are platform-native and cannot transfer — we document each automation's trigger and action sequence so your team can rebuild them in Mailchimp Customer Journeys. The migration uses Fello's batched CSV export against Mailchimp's Contact API with batch upsert, handling deduplication by email address. A 24–48-hour delta pickup window captures any contacts added or modified in Fello during the cutover window.
Every standard and custom field arrives verified.
AI proposes the map; you confirm before any record moves.
Parent–child, lookups, and ownership stay linked.
Calls, emails, meetings — with original timestamps.
Documents, uploads, and inline notes move with the record.
Why teams make this switch
Leaving
What's pushing teams away
Choosing
What's pulling them in
Object mapping
Each row shows how a Fello object lands in Mailchimp, including any object-level transformations, lookup resolution, or schema-design dependencies.
Typical mapping — final map is confirmed during the sample migration step.
Fello
Contact
Mailchimp
Audience Member (Subscriber)
1:1Fello contacts map 1:1 to Mailchimp audience members. Each contact's email address is the unique key for deduplication during import. First name, last name, email, phone, and address fields map to Mailchimp's built-in subscriber fields. Contacts without an email address are flagged and excluded — Mailchimp requires an email address for audience membership.
Fello
Lead Score
Mailchimp
Merge Field (numeric)
1:1Fello's AI lead score (0–100 scale) has no Mailchimp native equivalent. We create a numeric merge field (Fello_Lead_Score) in Mailchimp and import each contact's score as a number value. This field can then drive Mailchimp segment conditions for targeting high-propensity leads in campaigns.
Fello
Custom Field (listing-related)
Mailchimp
Merge Field (text or dropdown)
1:1Fello custom fields scoped to real estate (property type, neighborhood, listing stage, estimated home value) require corresponding Mailchimp merge fields. Text fields map to Mailchimp text merge fields. Pick-list values from Fello map to Mailchimp dropdown merge fields with the same option set. Merge field names are truncated to Mailchimp's 30-character limit.
Fello
Tag
Mailchimp
Tag
1:1Fello tags migrate as Mailchimp tags with full name preservation. During the CSV import, each contact's tag list is parsed and applied as individual Mailchimp tags. Duplicate tag names are handled automatically — Mailchimp deduplicates tag names at the audience level. The full tag vocabulary is preserved so segmentation logic carries over.
Fello
TCPA Consent
Mailchimp
Merge Field (text/date)
1:1Fello captures TCPA consent timestamps and consent type (call, text, email) as separate fields. These migrate to Mailchimp as a text merge field (TCPA_Consent) storing the consent type and a date merge field (Consent_Date) for the timestamp. Mailchimp does not enforce consent flags — this data is preserved for compliance records.
Fello
Company / Brokerage
Mailchimp
Merge Field (text)
1:1Fello contacts often associate with a brokerage or company name. Mailchimp has no native company field, so we map this to a text merge field (Brokerage_Name). If the contact's company is used for segmentation, it can be stored as a separate merge field and used to build Mailchimp segments by company name.
Fello
Agent Owner ID
Mailchimp
Merge Field (text)
1:1Fello's owner ID (agent who owns the contact record) is a foreign key with no Mailchimp equivalent. We preserve it as a text merge field (Fello_Owner_ID) so teams can reference which agent a contact belonged to in Fello. Mailchimp's built-in 'Owner' concept does not map to Fello's agent-owner model.
Fello
Home Value Estimate
Mailchimp
Merge Field (number)
1:1Fello enriches contacts with estimated home value data from its AI model. This numeric value migrates to a Mailchimp number merge field (Est_Home_Value). Mailchimp supports numeric merge fields for segmentation but not for calculations — the value is stored for targeting use cases like 'contacts in homes valued over $500K.'
Fello
Workflow / Automation
Mailchimp
Customer Journey (must be rebuilt)
1:1Fello Smart Workflows trigger outreach based on lead score changes, listing signals, or agent actions. Mailchimp Customer Journeys have no migration path — these must be designed and built from scratch in Mailchimp's journey builder. We provide a workflow export document detailing each Fello automation's trigger, conditions, and actions for manual rebuild reference.
Fello
Segment / Contact List
Mailchimp
Segment
1:1Fello segments based on lead score thresholds, listing stage, or custom field values translate to Mailchimp segments built from equivalent merge field conditions. Because Mailchimp segments are defined by merge field rules rather than saved lists, we document each Fello segment's criteria so it can be replicated as a Mailchimp segment filter condition.
| Fello | Mailchimp | Compatibility | |
|---|---|---|---|
| Contact | Audience Member (Subscriber)1:1 | Fully supported | |
| Lead Score | Merge Field (numeric)1:1 | Fully supported | |
| Custom Field (listing-related) | Merge Field (text or dropdown)1:1 | Fully supported | |
| Tag | Tag1:1 | Fully supported | |
| TCPA Consent | Merge Field (text/date)1:1 | Fully supported | |
| Company / Brokerage | Merge Field (text)1:1 | Fully supported | |
| Agent Owner ID | Merge Field (text)1:1 | Fully supported | |
| Home Value Estimate | Merge Field (number)1:1 | Fully supported | |
| Workflow / Automation | Customer Journey (must be rebuilt)1:1 | Fully supported | |
| Segment / Contact List | Segment1:1 | Fully supported |
Gotchas + challenges
Platform-specific issues from each side, plus the pair-specific challenges that don't show up on either platform's page on its own.
Fello gotchas
No public API — all data export is CSV only
Automation workflows must be manually rebuilt
Contact export requires filtering before export job
Lead score is Fello-computed and proprietary
Mailchimp gotchas
Contact count includes unsubscribed and non-subscribed records
Automation workflows cannot be exported
Account suspensions trigger silently during migration
Template HTML is Mailchimp-specific and may not render in other platforms
E-commerce data requires active store connection
Pair-specific challenges
Migration approach
Audit Fello custom fields and export contacts
We pull the full Fello contact export from the platform's CSV export tool, capturing all standard fields, custom fields, tags, lead scores, and system timestamps. We review the export for duplicate records, missing email addresses, and field completeness. A pre-migration data quality report identifies contacts without emails (excluded from Mailchimp), contacts with duplicate emails (deduplicated by most-recent-update rule), and fields that need merge field creation in Mailchimp before import.
Configure Mailchimp merge fields and audience structure
Before data lands, we create all required merge fields in the target Mailchimp audience — numeric fields for lead scores and home values, date fields for consent timestamps, text fields for owner IDs and system references, and dropdown fields for listing stage and property type pick-lists. We apply Mailchimp's 30-character tag naming convention to each Fello field and generate a cross-reference document mapping original Fello field names to Mailchimp merge field tags.
Run sample migration with field-level diff
A representative slice of 100–500 Fello contacts migrates first using Mailchimp's batch contact upsert API. We generate a field-level diff comparing each source field against the destination merge field value so you can verify lead score mapping, tag preservation, and custom field truncation before the full run commits. Owner resolution by email match is validated at this stage — any Fello contacts with unmatched emails are flagged for manual review.
Execute full migration with delta-pickup window
The complete Fello contact set migrates in batched API calls against the Mailchimp Contacts API. A delta-pickup window of 24–48 hours runs concurrently with the cutover, capturing any new contacts added or field updates made in Fello during the migration window. All tags are applied via Mailchimp's tag API after contact import. An audit log records every upserted record, and one-click rollback is available if the reconciliation count shows unexpected variance.
Deliver automation rebuild reference and post-migration verification
After migration, we deliver a structured export of every Fello Smart Workflow — trigger type, condition logic, and action sequence — formatted as a rebuild guide for Mailchimp Customer Journeys. We also deliver the merge field cross-reference document and a post-migration record count verification against Fello's original export total. Suppression list handling (unsubscribed contacts from Fello) is documented separately so your team can import them to Mailchimp's suppression list without incurring billing charges.
Platform deep dives
Fello
Source
Strengths
Weaknesses
Mailchimp
Destination
Strengths
Weaknesses
Complexity grading
Standard CRM migration. All 8 core objects map 1:1 between Fello and Mailchimp.
Overall complexity
Standard migration
Derived from compatibility, mapping clarity, API constraints, and data volume across Fello and Mailchimp.
Object compatibility
All 8 core objects map 1:1 between Fello and Mailchimp.
Field mapping clarity
Field mapping is derived from defaults — final spec confirmed during the sample migration.
Timeline complexity
8-object category — typical timelines run 2–7 days end-to-end.
API constraints
Fello: Not publicly published..
Data volume sensitivity
Fello doesn't expose a bulk API — REST + parallelization used for high-volume runs.
Estimator
Rule-based pricing — no per-record fees, no manual quotes. Migrations over 2M records are scoped individually.
Step 1
Pick a category, then your source and destination platforms.
Category
FAQ
Answers to the questions buyers ask most during Fello to Mailchimp migration scoping. Not seeing yours? Book a call.
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