Deliverability Guarantee &
Credit Refund Policy

We put our credits where our results are. Here is exactly what we promise, what qualifies, and how refunds are calculated.

Last updated: August 24, 2026

The promise

Deliverability decides how much of your campaign actually reaches the inbox. Emails Checker follows industry best practices for verification, and we back our results with a 97.5% (or better) deliverability rate guarantee. When our accuracy falls short of the targets below on a qualifying campaign, we top up your account with additional verification credits, calculated automatically.

Accuracy targets

Address type Guaranteed accuracy
AOL, Yahoo, and Office 365 accounts 75% or better
Everything else 98% or better
Overall deliverability across a qualifying send 97.5% or better

Accuracy is measured by comparing addresses we marked Deliverable / Valid against how your mail provider actually reported them after your send.

Eligibility criteria

To qualify for the guarantee, your mailing practices must match all of the following:

  • The batch contains at least 1,000 email addresses, verified with Emails Checker and sent within a 12-hour period.
  • Sent addresses are those classified as Deliverable and Valid by Emails Checker.
  • Bounces counted against the guarantee are the result of an invalid (non-existing) email address.
  • The list is an opt-in list that you collected yourself; it must not have been purchased from a third party.
  • You contact support within 30 days of the discrepancy.

What is not covered

Bounces caused by anything other than genuinely invalid addresses do not qualify. Unqualified bounces include, but are not limited to:

  • poor sender reputation or a blacklisted sending IP;
  • mail server misconfiguration or unavailability;
  • bounces triggered by spam content, attachments, or links;
  • technical issues, throttling, or invalid mail configuration on your side;
  • role-based or catch-all addresses that accepted the message but filtered it later; and
  • complaint-driven blocks resulting from your sending practices.

Known provider quirks

AOL / Yahoo legacy addresses: if your list contains old Yahoo or AOL addresses, please contact support before validating so we can suggest the best way to manage those lists.
GMX / WEB.de: Emails Checker validates these domains with special methods, so you may see more bounces, possibly more than 10%.

How to claim

If you believe we have not met the guarantee, email [email protected] within 30 days of the discrepancy and include:

  1. the name or ID of the verified batch;
  2. your ESP's bounce report for the send; and
  3. a short description of when the send occurred.

We review claims within five business days and, once confirmed, add the credited amount to your account balance.

How credits are refunded

For every 1% your measured accuracy falls below the applicable threshold from Section 2, we add 3× that shortfall in verification credits. This is based on the total credits consumed verifying that batch.

Worked example. Suppose your list was guaranteed at the 98% target, but your bounce data shows 96% accuracy: a 2-point shortfall.

Refund = 3 × 2% = 6% of your total validation credits for that batch, added to your account. At 4 points below, it would be 12%, and so on.

Credit refunds never expire earlier than the credits they replace, cannot be exchanged for cash, and are subject to the general payment terms in our Terms of Service.

Hard-bounce promise

If you experience more than 10% hard bounces after using emails marked valid by our system, we will refund all credits consumed by that verification batch.

Contact us

Claims and questions about this guarantee: [email protected], or write to Kalpraj Solutions (OPC) Private Limited., GAT NO. 183, TRUSHNIT PARK, NANEKARWADI, CHAKAN, KHED, Pune, Maharashtra, 410501, INDIA.

Related documents: Terms of Service · Privacy Policy