Cancel your Poseidon subscription by mail
Cancelling Poseidon means putting it in writing; the company takes requests by mailed letter, and a tracked one leaves a clear record. Letters to Poseidon go to Göteborg, Sweden.
Let Postbye cancel Poseidon 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 Poseidon.
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- 3 Poseidon cancellations handled this month
- Certified mail with tracking
- Mailed every business day
- Delivery proof sent to you
- We confirm your cancellation
How to cancel Poseidon by mail
Gather your account details
Put the name and email on the account and, if you have one, an account or customer number in front of you before you write: the request to Poseidon is only as good as the details it quotes.
Write your request
Because Poseidon is dealt with in Swedish, the letter is written in Swedish (template sv). Subject: “Ämne: Begäran om uppsägning – [your name]”. It requests an end to the subscription and to every further charge, plus written confirmation.
Post it with proof of delivery
Send it certified to Göteborg, Sweden, copying the address from the next section letter for letter, and keep the receipt slip.
Hold on to the receipt
Once the letter is delivered, the date on the receipt is the date Poseidon was told. Compare it with your statements over the next billing cycle.
With Postbye, steps 2 to 4 take about two minutes of your time.
Where your Poseidon cancellation letter goes
Poseidon takes its post at Östra Hamngatan 16, 411 09 Göteborg, Sweden, which is where a cancellation letter belongs.
Copy the postal code 411 09 exactly: it is what routes the letter to Västra Götalands län, Sweden.
The letter greets the reader with “Till berörd part,”; your own details sit under the labels Kontoinnehavare, Registrerad faktureringsadress and Registrerad e-postadress.
Prefer to write it yourself? Use our letter template
Every address we hold for Poseidon, with the envelope wording
Before you cancel Poseidon, check these
- Cancelling usually ends access at the end of the period you paid for, so you keep what you paid for until then.
- 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.
Several states set rules for subscriptions that renew on their own. See what yours requires in automatic renewal laws by state.
Let Postbye cancel Poseidon 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.
A mailed letter is slower than a phone call but it is the version that proves what you asked for and when.
Poseidon cancellation at a glance
- How Poseidon accepts cancellations
- By mailed letter
- Mailing address on file
- Poseidon Östra Hamngatan 16 411 09 Göteborg Sweden
- Country
- Sweden
- Letter language
- Swedish (template sv)
- Added to the database
- June 25, 2026
- Data last checked
