Terms of Service
Last updated: October 2026
These terms cover your use of QuickInbox — both the free disposable/permanent email service at quickinbox.net and the paid Business API. By using either, you agree to these terms.
The free service
QuickInbox's disposable and permanent email features are provided as-is, free of charge, with no account required for disposable addresses. We don't guarantee uptime, delivery, or that any particular message will arrive. Don't use the free service for anything you depend on long-term or for sensitive personal, financial, or medical information — see our Privacy & Disclaimer page for details.
The Business API
Business API accounts are subject to the plan limits (monthly email volume, retention period, and features) shown on our pricing page at the time of signup or upgrade. We may change pricing or plan limits going forward, but we won't change what you're already paying for mid-billing-cycle without notice. Paid plans are billed in advance. See our Refund Policy for our 7-day money-back guarantee on first payments.
Acceptable use
You may not use QuickInbox (free or paid) to violate any law, to harass or defraud anyone, to circumvent another service's own terms of use through automated abuse, to send or distribute malware or illegal content, or to attempt to disrupt, overload, or gain unauthorized access to our systems. We may suspend or terminate access, with or without notice, for use we reasonably believe is abusive, fraudulent, or illegal.
Accounts
For Business API and permanent-address accounts, you're responsible for keeping your login credentials and API keys confidential and for all activity under your account. Tell us right away if you believe a key or password has been compromised.
Disclaimer and limitation of liability
QuickInbox is provided "as is," without warranties of any kind, express or implied. To the maximum extent permitted by law, we are not liable for indirect, incidental, or consequential damages arising from your use of the service, including lost messages, lost data, or lost business.
Changes
We may update these terms from time to time. Material changes will be reflected by an updated "last updated" date on this page.
Contact
Questions about these terms: info@sigmaeng.net. See also our Refund Policy.