Terms of Service
Effective October 12, 2026
These terms govern your use of InboxGrade. By using the service you agree to them. InboxGrade is operated by Tubesock, Inc. (a dba of Rob Nolley, Inc.), 30 E. Washington St., Suite 400, Shelbyville, IN 46176, USA.
The service
InboxGrade grades email deliverability by analyzing messages you send to our test addresses. Free tier is unlimited one-off tests with 30-day retention. Pro ($29/mo) and Agency ($99/mo) tiers add dashboard history, PDF export, monitoring, and (Agency) white-label reports.
Your account
- You're responsible for everything that happens under your account. Keep your sign-in email secure.
- You must be at least 18 to sign up, or have your organization's authority to agree to these terms.
- One account per person. Agencies may manage multiple domains under one Agency-plan account.
Acceptable use
Don't use InboxGrade to:
- Test deliverability of unsolicited bulk mail. If you're warming an IP for spam, this isn't the tool for you.
- Reverse-engineer our scoring to evade spam filters at scale.
- Automate test minting beyond the published rate limits (currently 10 mints/minute per IP).
- Resell access to our scoring API or report pages as your own product.
- Submit content to us that's illegal, infringes third-party rights, or is otherwise malicious.
We may terminate accounts that violate these rules. We're reasonable about this — if we think you're skirting, we'll usually ask first.
Billing
- Paid plans are billed monthly or annually in advance via Stripe.
- You can cancel any time from your billing portal; access continues through the end of the paid period, no refund for partial periods.
- If a payment fails, we'll email you and retry; after a reasonable grace period we'll downgrade the account to Free.
- Prices may change with 30 days' notice to existing subscribers.
Monitoring (Pro/Agency)
Monitoring probes are sent from your mail server to our ingest address via a shell script we provide. You're responsible for installing, running, and uninstalling the script. We don't guarantee alert delivery timing — alerts email on a 5-minute drain cycle. See /monitoring for the full technical disclosure.
Service availability
We aim for high uptime but don't offer an SLA on paid plans at this time. If we have a material outage, we'll credit affected subscriptions at our discretion.
Content and ownership
You own the email content you submit. We retain parsed metadata as described in our Privacy Policy. We own the InboxGrade name, software, scoring methodology, and report page design.
Disclaimer and liability
The service is provided as-is. Our grading is a snapshot of what we observe at test time; a passing grade doesn't guarantee any particular recipient's inbox will accept your mail, and a failing grade doesn't mean mail definitely won't deliver. Use your judgment.
To the maximum extent permitted by law, our total liability for any claim is limited to what you paid us in the three months prior to the claim.
Governing law
Indiana law, excluding conflict-of-law rules. Any dispute goes to the state or federal courts located in Marion County, Indiana.
Changes
If we materially change these terms, we'll bump the Effective date and notify signed-in users. Continuing to use the service after notice means you accept the change.