Cancel your Mutex subscription by mail
Mutex deals with cancellations through the post, so the request goes in a letter and the certified-mail receipt is your proof of when. Mutex receives written requests in Châtillon, France.
Let Postbye cancel Mutex for you
We write your letter, mail it by certified mail the next business day, and confirm when the cancellation went through. You keep the signed proof.
Money-back guarantee within 10 business days.
Postbye is not affiliated with Mutex.
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- 3 Mutex cancellations handled this month
- Certified mail with tracking
- Mailed every business day
- Delivery proof sent to you
- We confirm your cancellation
How to cancel Mutex by mail
Collect the details you need
Start with the policy number, the name on the policy and the date you want cover to end, so the request to Mutex names the right account the first time.
Set out the request
Mutex is based in France, so the letter goes out in French, built from our French template. Subject line: “Objet : Demande d'annulation – [your name]”. It asks for the subscription to end, for further charges to stop and for written confirmation.
Send the letter by certified mail
Address the envelope to Mutex, Châtillon, exactly as printed in the next section. Certified mail gives you a tracking number and a delivery record.
Keep proof the letter arrived
It shows the date Mutex received your letter. Check your next statement: no Mutex charge should post after the cancellation date.
With Postbye, steps 2 to 4 take about two minutes of your time.
Where your Mutex cancellation letter goes
Written requests to Mutex go to Avenue de Paris 125, 92320 Châtillon, France.
Copy the postal code 92320 exactly: it is what routes the letter to Île-de-France, France.
Your details go in a block headed by Titulaire du compte, Adresse de facturation enregistrée and E-mail enregistré, and the opening line is “À qui de droit,”.
Prefer to write it yourself? Use our letter template
Before you cancel Mutex, check these
- Ask for written confirmation of the end date and of any refund due.
- Do not cancel until replacement cover starts. A gap in cover can be costly.
- Premiums paid in advance may be refundable for the unused period. Ask how it is calculated.
Several states set rules for subscriptions that renew on their own. See what yours requires in automatic renewal laws by state.
Let Postbye cancel Mutex for you
We write your letter, mail it by certified mail the next business day, and confirm when the cancellation went through. You keep the signed proof.
Cancelling a insurance or protection plan
Insurers cancel by policy and by effective date, so the request has to name the policy number and the date cover should stop, ideally after replacement cover is in place.
A mailed letter is slower than a phone call but it is the version that proves what you asked for and when.
Mutex cancellation at a glance
- How Mutex accepts cancellations
- By mailed letter
- Mailing address on file
- Mutex Avenue de Paris 125 92320 Châtillon France
- Country
- France
- Letter language
- French (template fr)
- Category (from the company name)
- Insurance & protection plans
- Added to the database
- June 4, 2026
- Data last checked
