What is the MCPopupClosed cookie?
MCPopupClosed is an HTTP cookie associated with Mailchimp (Intuit Mailchimp) email marketing services. It appears on a website when the site owner has embedded a Mailchimp pop-up or slide-in form to collect email addresses (newsletter signup, discounts, offers).
The cookie is set by the Mailchimp form's JavaScript code, not by the site's own server infrastructure, at the moment a visitor closes the pop-up without subscribing.
What data it stores
The cookie value is typically a simple flag (yes/no type indicator or a timestamp) signaling that the pop-up was dismissed. The exact value format is not publicly documented in detail and may vary depending on the version of the Mailchimp script used.
The data isn't sent to Mailchimp on every page load as separate telemetry; the cookie is read locally by the browser script to decide whether to show the pop-up again.
What it is used for
The cookie serves a purely user-experience purpose: it avoids repeatedly and annoyingly showing the same signup form to a visitor who has already dismissed it. For the site owner, this reduces pop-up annoyance and bounce rates and keeps browsing more pleasant, without directly affecting marketing data collection itself.
Does it require consent?
- CookieFix classifies it as a preferences (functional) cookie, since it stores a user interface choice rather than statistical or advertising data.
- Under the ePrivacy Directive (transposed in Romania via Law 506/2004) and GDPR, preference/functional cookies that aren't strictly necessary for the service explicitly requested by the user generally require prior consent.
- Site owners should declare it in their cookie policy, correctly categorize it as a preference cookie, and ensure it isn't set before consent is given.
How to block or delete MCPopupClosed
A visitor can delete or block this cookie through browser settings (Chrome, Firefox, Edge, Safari – per-site cookie management), which will make the Mailchimp pop-up reappear on the next visit.
For site owners, the correct approach is using a CMP like CookieFix, which automatically blocks the Mailchimp pop-up form script until the visitor gives consent for the preferences category, preventing the cookie from being set prematurely.
Frequently asked questions
No, it's a simple functional cookie that only remembers whether a signup pop-up was closed, with no cross-site tracking or advertising purpose.
Its typical duration is about 1 year, after which the browser removes it automatically if the visitor doesn't return to the site.
Yes, since it's classified as a preferences cookie and isn't strictly necessary for the site's core functionality, it requires the visitor's prior consent.
The Mailchimp pop-up form will be shown again on the next visit, since the site no longer has a record of the earlier dismissal choice.