Where to send your Slack cancellation letter
Read the addresses on this page next to the full guide to cancelling Slack.
The addresses we hold
One place for Slack's mailing addresses: the San Francisco delivery point for a cancellation letter first, then the rest of what the database holds, with envelope wording that matches.
Where the letter goesMailing address
Slack500 Howard StSan Francisco, CA 94105Slack takes its post at this California address (ZIP 94105).
How to address the envelope
Copy it exactly onto the envelope
Address the envelope to 500 Howard St, San Francisco, CA 94105. Everything on those lines matters for the sorting machines, so nothing is abbreviated by hand.
Put your own address on it
Print your return address in the top-left corner. Without it, an undeliverable letter is simply lost instead of returned to you.
Certified mail, not a courier
Take the letter to a post office counter and ask for certified mail: you get a postmarked receipt and a delivery record. Keep the tracking number and check it until it shows delivered.
Keep what the post office gives you
Your copy of the letter, the mailing receipt and the tracking record belong together in one file, especially with the notice rule: Choose whether the downgrade takes effect immediately or at the end of the billing period.
The letter, written out
Copy the letter below onto one page, fill in the account email, the plan or product name and the invoice or order number from your latest receipt, and it is ready for the envelope. Our template builds the same letter on screen.
[Your name] [Your street address] [City, State ZIP] [Your email address]
[Date]
Slack 500 Howard St San Francisco, CA 94105
To whom it may concern,
I am cancelling my account with Slack, account or member number [number], with effect from [date or "immediately"]. Please end every add-on and linked plan on this account at the same time.
I am giving notice under my agreement: Choose whether the downgrade takes effect immediately or at the end of the billing period.
Please stop all future charges to my payment method, remove my stored payment details, and send written confirmation of the cancellation and its effective date to [your email address].
Sincerely, [Signature] [Your printed name]
Keep reading
The full guide to cancelling this company, our letter template and the postal guides.
Let Postbye cancel Slack 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.