Your customer data lives in Odoo. Your email lives in Mailchimp. Every day someone exports a CSV, cleans it, uploads it, and the two systems drift apart again by lunchtime. Unsubscribes never make it back to Odoo. Nobody in Sales can see who opened last week's campaign. Segments built in Odoo have to be rebuilt by hand in Mailchimp.

Mailchimp Two-Way Sync is a build-to-order Odoo module that ECOSIRE designs, builds, installs and supports for your database. It keeps res.partner contacts, Odoo segments and tags, and Mailchimp audiences continuously aligned in both directions, and it pushes campaign engagement (opens, clicks, bounces, unsubscribes) straight back onto the contact and lead records your team already works in.

This is not an off-the-shelf apps.odoo.com download and there is no instant download. After purchase, our Odoo engineers scope your exact audiences, field mappings and subscriber rules, then build a proper Odoo addon: a __manifest__.py declaring the module and its dependencies (typically base, contacts, mail, and crm when engagement-to-lead sync is in scope), models extending res.partner and new sync-log models built on models.Model, secured with ir.model.access.csv access rules and record rules so only the right users touch sync configuration.

Under the hood the module talks to the Mailchimp Marketing API over authenticated HTTPS, maps Odoo segments and tags to Mailchimp segments/tags, and reconciles state on both sides using a stable Mailchimp email_id hash so re-syncs are idempotent and never duplicate members. Outbound changes fire from Odoo automated actions and scheduled ir.cron jobs; inbound engagement is captured via Mailchimp webhooks (or scheduled pulls where webhooks are not viable) and written back with member-level rate-limit handling and retry. Because it is a native addon, it also exposes its sync operations to your other systems over Odoo's XML-RPC / JSON-RPC API.

Subscriber status is treated as the source of truth on the Mailchimp side for compliance: a Mailchimp unsubscribe or clean flips the matching Odoo contact's opt-out, so you never email someone who has left. Conversely, contacts you archive or opt out in Odoo are suppressed in the audience. Opens and clicks land on the contact and, where mapped, drive CRM automation — a click on a pricing campaign can raise a lead, notify the owner, or advance a stage.

We build it for Odoo 17, 18 and 19, on Community or Enterprise, and hand you the full source, documentation, a mapping configuration you control, training for your team, and a support window. You own the code.