Rex

Connect Mailchimp

Connect Mailchimp to add the guests who book with you to a Mailchimp audience. You connect your Mailchimp account once, then set up each venue: which audience its guests join, which Rex fields fill which Mailchimp fields, and which tags they get. A venue can also send its event inquiries to Mailchimp.

Connect your Mailchimp account

1

Navigate to Global Integrations

Type Mailchimp in the search box to find its card.

Marketplace›Integrations
Global Integrations page with Mailchimp typed in the search box (1) and the Mailchimp card below
Search for Mailchimp to find its card.
2

Add the Mailchimp card

Click Add, then Confirm and Add. If the card already shows Info and Settings, it's added, so go to the next step.

The Mailchimp card with its Active badge (2) and the Info and Settings buttons, Settings marked (3)
A card that shows Info and Settings is already added; click Settings to open the Mailchimp window.
3

Click Settings on the Mailchimp card

The Mailchimp window opens.

The Mailchimp window (3) on the account's Global Integrations page, showing Version v2 (OAuth), a Disconnected badge and the Connect button
The Mailchimp window opens with the account's connection status.
4

Select v2 (OAuth) as the Version

This is the default. Reservation syncing, and the venue's list, field mappings and tags, all use this connection.

The Version dropdown (4) open in the Mailchimp window, listing v2 (OAuth) and v1 (API Key)
Select v2 (OAuth) as the Version.
5

Click Connect

Sign in to Mailchimp in the window that opens and allow access. The status changes from Disconnected to Connected.

Mailchimp window with the Version dropdown set to v2 (OAuth) (4) and the Connect button (5)
Pick v2 (OAuth) and click Connect. Once you've signed in, the status reads Connected.

To also send event inquiries to Mailchimp, switch Version to v1 (API Key), enter your Mailchimp Audience ID and API Key, and click Save changes. Rex uses this second connection only for event inquiries, and both connections can be saved at the same time.

Set up each venue

1

Navigate to the venue

Open the venue. The Integrations section is at the bottom of the General tab.

Manage›Venues›Your Venue›General
The Integrations section at the bottom of the venue's General tab (1) with the Mailchimp card's Settings button (2)
Each venue has its own Mailchimp card in the Integrations section.
2

Click Settings on the Mailchimp card

The Mailchimp Settings window opens.

The venue's Mailchimp Settings window (2) with Enable Mailchimp, Enable Mailchimp Party, List, Tags and Save changes
Clicking Settings on the venue's Mailchimp card opens its Settings window.
3

Toggle Enable Mailchimp to ON

Rex sends this venue's new reservations to Mailchimp. Turn on Enable Mailchimp Party too if this venue's event inquiries should go to Mailchimp (this needs the v1 (API Key) connection).

The venue's Mailchimp Settings window: Enable Mailchimp (3), List (4), Tags (6) and Save changes (7)
Field Mappings appear under List once you pick a list.
4

Select a List

Pick the Mailchimp audience this venue's guests should join. The Field Mappings section appears below it.

The List dropdown (4) open in the venue's Mailchimp Settings window, listing the Mailchimp audiences
Pick the audience this venue's guests should join.
5

Map your fields

For each Rex field (Email, First Name, Last Name, Phone Number, Venue, Reservation Number, Reservation Date), choose the Mailchimp field it fills, or tick Ignore. Add item maps a checkout question to a Mailchimp field. Click Save Mapping (Update Mapping once a mapping exists).

The Field Mappings section (5) with each Rex field set to a Mailchimp field, the Ignore tick boxes, Add item and Save Mapping
Choose the Mailchimp field for each Rex field, then click Save Mapping.
6

Add tags (optional)

Under Tags, click Add Tag and pick a Tag Source: a checkout question, or Custom Text to type your own tag. Click Save Tags (Update Tags once tags exist). Rex adds these tags to every guest this venue sends.

The venue's Mailchimp Settings window after clicking Add Tag, with the new Tag Source dropdown (6) and the Save Tags button
Each tag gets a Tag Source: a checkout question or Custom Text.
7

Click Save changes

This saves the Enable Mailchimp and Enable Mailchimp Party switches and closes the window.

The bottom of the venue's Mailchimp Settings window with the Save changes button (7) beside Cancel
Save changes saves the two switches and closes the window.
⚠️Warning

Save changes saves only the two switches. Field mappings and tags have their own Save Mapping and Save Tags buttons, so click those before you close the window. Rex sends nothing for a venue until its list has a saved mapping.

Check that it works

Make a test reservation at the venue, then look for the guest's email in the Mailchimp audience you picked. Each reservation's integration history records a failed Mailchimp sync with the error Mailchimp returned, and Rex emails the failure to the venue's error notification emails.

Troubleshooting

Reservations don't reach Mailchimp

Possible causes

  • •Enable Mailchimp is off at the venue
  • •The venue's list has no saved field mapping
  • •The account isn't connected with v2 (OAuth)

Fix

Manage›Venues›Your Venue›General

Open the venue's Mailchimp Settings, turn on Enable Mailchimp, pick the list and click Save Mapping, then click Save changes. On the account card, check that v2 (OAuth) shows Connected.

The venue's Mailchimp Settings window with the Enable Mailchimp switch and the List dropdown highlighted

The List dropdown is empty

Possible causes

  • •The account isn't connected with v2 (OAuth), or the connection has expired

Fix

Marketplace›Integrations

Open the Mailchimp card's Settings, select v2 (OAuth), click Disconnect if it shows Connected, then click Connect and sign in again.

The account Mailchimp window on v2 (OAuth) with the Connect button highlighted

Event inquiries don't reach Mailchimp

Possible causes

  • •Enable Mailchimp Party is off at the venue
  • •No v1 (API Key) connection is saved

Fix

Marketplace›Integrations

Turn on Enable Mailchimp Party in the venue's Mailchimp Settings, then on the account card switch Version to v1 (API Key), enter the Audience ID and API Key, and click Save changes.

The account Mailchimp window switched to v1 (API Key) with the Version dropdown, Audience ID and API Key fields highlighted (values blurred)

Updated Oct 8, 2026

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