Cancel your Knowunity subscription by mail
Knowunity takes cancellation requests by mailed letter, so a dated certified-mail letter is the record that counts. The cancellation address on file for Knowunity is in Berlin, Germany.
Let Postbye cancel Knowunity 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 Knowunity.
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- 2 Knowunity cancellations handled this month
- Certified mail with tracking
- Mailed every business day
- Delivery proof sent to you
- We confirm your cancellation
How to cancel Knowunity by mail
Find your account details
Check the name and email on the account and, if you have one, an account or customer number before anything else. A request that does not match the account on file at Knowunity is the easiest one to set aside.
Draft the request
Postbye drafts the request in German, the language of Germany, with “Betreff: Kündigungsanfrage – [your name]” as the subject line. It asks Knowunity to close the subscription, stop billing and confirm in writing.
Send the letter by certified mail
Use certified mail for the 10115 Berlin address in the next section, so the post office records the delivery. Write down the tracking number.
Save the tracking record
Keep the tracking record with your copy of the letter. If Knowunity bills you after the date it received the request, you have the dates to point to.
With Postbye, steps 2 to 4 take about two minutes of your time.
Where your Knowunity cancellation letter goes
Written requests to Knowunity go to Julie-Wolfthorn-Straße 1, 10115 Berlin, Germany.
Postal code 10115 places the address in Berlin, Germany.
Your name, address and email appear in a short block labelled Kontoinhaber, Hinterlegte Rechnungsadresse and Hinterlegte E-Mail-Adresse, under the greeting “Sehr geehrte Damen und Herren,”.
Prefer to write it yourself? Use our letter template
Every address we hold for Knowunity, with the envelope wording
Before you cancel Knowunity, check these
- Write well before the next billing date. A request that arrives after it can leave one more charge on your statement.
- If an app store or phone carrier bills you, the company cannot cancel it. Cancel with that partner as well.
- Cancelling usually ends access at the end of the period you paid for, so you keep what you paid for until then.
Several states set rules for subscriptions that renew on their own. See what yours requires in automatic renewal laws by state.
Let Postbye cancel Knowunity 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.
How cancelling by mail works
Most subscriptions keep billing until someone tells the company to stop, and a dated letter is proof that somebody did.
A mailed letter is slower than a phone call but it is the version that proves what you asked for and when.
Knowunity cancellation at a glance
- How Knowunity accepts cancellations
- By mailed letter
- Mailing address on file
- Knowunity Julie-Wolfthorn-Straße 1 10115 Berlin Germany
- Country
- Germany
- Letter language
- German (template de)
- Added to the database
- June 19, 2026
- Data last checked
