Where to send your Substack cancellation letter
Read the addresses on this page next to the full guide to cancelling Substack.
The addresses we hold
The address a cancellation letter to Substack needs, and every other address we hold, starting in San Francisco,: copy the lines exactly and the envelope sorts itself.
Where the letter goesMailing address
Substack111 Sutter Street7th FloorSan Francisco,, CA 94104California, ZIP 94104: where mail for Substack is delivered.
How to address the envelope
Use the address letter for letter
One address block, copied whole: 111 Sutter Street, 7th Floor, San Francisco,, CA 94104. If any line differs from the card above, start the envelope again.
Put your own address on it
Your name and postal address go top-left on the front (or the back flap). If the letter cannot be delivered it comes back to you, which is itself evidence of the attempt.
Certified mail, not a courier
Certified mail is bought at the post office: hand the letter to a postal employee, keep the postmarked receipt, and follow the article number until the delivery shows.
Keep the records
Your copy of the letter, the mailing receipt and the tracking record belong together in one file, especially with the notice rule: Paid access continues to the end of the billing period; no further charges.
Your letter to Substack
A plain, dated letter to Substack asking for the cancellation, the end of every charge and written confirmation. Have the email on the account, the delivery address for print copies and the subscription or reference number from your latest invoice to hand; our letter template fills the same shape in on screen.
[Your name] [Your street address] [City, State ZIP] [Your email address]
[Date]
Substack 111 Sutter Street 7th Floor San Francisco,, CA 94104
To whom it may concern,
I am cancelling my account with Substack, 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: Paid access continues to the end of the billing period; no further charges.
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 Substack 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.