Cancel your Gmass subscription by mail
For Gmass the route is a written letter: cancellation requests are taken by post, and certified mail shows when yours arrived. The cancellation address on file for Gmass is in Chicago, United States.
Let Postbye cancel Gmass 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 Gmass.
- 4.8 from 2,931 reviews
- 3 Gmass cancellations handled this month
- Certified mail with tracking
- Mailed every business day
- Delivery proof sent to you
- We confirm your cancellation
How to cancel Gmass by mail
Note 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 Gmass has on file.
Write the cancellation request
Postbye turns the request into a finished English letter headed “Subject: Subscription termination – Gmass”: close the Gmass account, stop every charge and reply in writing.
Send it by certified mail
Send it certified to Chicago, United States, copying the address from the next section letter for letter, and keep the receipt slip.
Save the tracking record
Keep the tracking record with your copy of the letter. If Gmass 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 Gmass cancellation letter goes
The mailing address we hold for Gmass is 401 Unit 63E N Wabash Ave, Chicago, IL 60611.
Chicago is in Illinois (ZIP 60611), a domestic address for certified mail within the United States.
Your details go in a block headed by Name, Address and E-mail, and the opening line is “To Whom It May Concern,”.
Prefer to write it yourself? Use our letter template
Before you cancel Gmass, 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 Gmass 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 phone call leaves nothing behind; a letter leaves a copy, a date and a delivery receipt.
Gmass cancellation at a glance
- How Gmass accepts cancellations
- By mailed letter
- Mailing address on file
- Gmass 401 Unit 63E N Wabash Ave Chicago, IL 60611
- Country
- United States
- Letter language
- English (template en)
- Added to the database
- April 30, 2026
- Data last checked
