Refund Policy
Last updated: October 2026
This policy covers paid subscriptions to the QuickInbox Business API (Starter, Growth, Enterprise, and Custom plans). It does not apply to the free disposable/permanent email service at quickinbox.net, which is not a paid product.
7-day money-back guarantee
We offer a 7-day money-back guarantee on your first payment for any paid Business API plan. If you're not satisfied for any reason, contact us at info@sigmaeng.net within 7 days of being charged and we'll refund that payment in full — no questions asked. Refunds are issued to the original payment method, and typically appear within 5–10 business days depending on your bank or card issuer.
Later renewals
This guarantee applies to your first payment on a plan. Requests on later monthly renewals are reviewed case by case — reach out and we'll take a look.
Cancelling instead of refunding
You can cancel your subscription at any time from your account's billing portal. Cancelling stops future billing; you keep access to your current plan until the end of the period you already paid for, so you don't need a refund just to stop being charged going forward.
How to request a refund
Email info@sigmaeng.net with the email address on your account and the plan you were charged for. We aim to respond within one business day.
Changes to this policy
We may update this policy from time to time. Material changes will be reflected by an updated "last updated" date on this page.