Cancel your Know How subscription by mail
To end a Know How subscription you write to them: Know How handles cancellations by post. Our database has Know How's mailing address in Amsterdam, Netherlands.
Let Postbye cancel Know How 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 Know How.
- 4.8 from 2,931 reviews
- 3 Know How cancellations handled this month
- Certified mail with tracking
- Mailed every business day
- Delivery proof sent to you
- We confirm your cancellation
How to cancel Know How by mail
Start with your account details
Have the name and email on the account and, if you have one, an account or customer number to hand. The details in the letter need to match what Know How has on file.
Write your request
Because Know How is dealt with in Dutch, the letter is written in Dutch (template nl). Subject: “Onderwerp: annuleringsverzoek – [your name]”. It requests an end to the subscription and to every further charge, plus written confirmation.
Mail the letter with a receipt
Use certified mail for the 1100 EC Amsterdam address in the next section, so the post office records the delivery. Write down the tracking number.
Keep the delivery receipt
Delivery confirmation is your evidence that Know How was asked. Watch the next statement or two for any further Know How charge.
With Postbye, steps 2 to 4 take about two minutes of your time.
Where your Know How cancellation letter goes
Written requests to Know How go to Postbus 23620, 1100 EC Amsterdam, Netherlands.
“Postbus 23620” is a post-office box or mail-sorting line, so it takes post and not couriers: certified mail is the right way to reach it.
Inside, the salutation reads “Geachte heer/mevrouw,”, followed by your details under Accounthouder, Factuuradres in dossier and E-mailadres in dossier.
Prefer to write it yourself? Use our letter template
Every address we hold for Know How, with the envelope wording
Before you cancel Know How, check these
- Use the same name and email as on the account. A mismatch can delay the request.
- Check your next statement: no charge should appear after the cancellation date.
- Look for annual or multi-month plans. A plan paid in advance usually runs to the end of the period you paid for.
Several states set rules for subscriptions that renew on their own. See what yours requires in automatic renewal laws by state.
Let Postbye cancel Know How 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
A subscription ends when the company records your request, not when you stop using it, and a letter is the record you can show later.
If a charge shows up after you cancelled, the letter and its receipt are what you put in front of the company or your bank.
Know How cancellation at a glance
- How Know How accepts cancellations
- By mailed letter
- Mailing address on file
- Know How Postbus 23620 1100 EC Amsterdam Netherlands
- Country
- Netherlands
- Letter language
- Dutch (template nl)
- Added to the database
- June 3, 2026
- Data last checked
