Our Guarantee

NeverBounce is extremely confident in providing the highest level of accuracy when cleaning lists of any size. In doing so, we are able to offer a 97% accuracy guarantee that your valid emails will not bounce after cleaning them using NeverBounce. Should more than 3% of your valid emails bounce after using our service, we will refund the difference back to you.

In order to meet this guarantee, the following is required:

  • The list must have been cleaned by NeverBounce within 72 hours of being mailed to.
  • The list must contain a minimum of 500 unique email addresses.
  • Our guarantee only covers mailing to deliverable addresses and not to those that have been categorized as invalid, catch-all, unknown or disposable.
  • Bounces due to internal technical issues, sender reputation, or similar technicalities will not qualify for our guarantee.
  • Email addresses that bounce must be indicated as invalid.

To submit a case for guarantee review, please provide the following via email to

  1. The Job ID in question processed through NeverBounce
  2. The date and time of sending
  3. The categories sent to (valid,catch-all, etc)
  4. An export of your full mailing containing all emails sent to and their bounce responses