Introducing domain age scoring in the validation response

Domains registered within the last 90 days are statistically more likely to be associated with spam or disposable services. OhBounce.ai now returns domainAgeDays on every response.

In our analysis of validation data over the past year, one signal stood out as consistently predictive of deliverability risk: domain age. Domains registered within the last 90 days are more than three times as likely to result in a hard bounce within six months compared to domains over two years old. We're now surfacing this signal directly in the API response.

What domainAgeDays tells you

The domainAgeDays field returns the number of days since the domain was first registered, based on WHOIS data. A value of 45 means the domain was registered 45 days ago. A value of null means WHOIS data was unavailable for the domain (common with some privacy-protected registrations).

How to use it in your workflows

• Flag addresses on domains under 30 days old for manual review before including in campaigns
• In sign-up flows, treat domains under 7 days old as suspicious — very few legitimate businesses register a domain and immediately use it for email
• Combine with other signals: a young domain + numeric local part + free TLD is a strong fraud signal
• For B2B prospecting, use domain age to prioritise outreach to established businesses over recently incorporated ones

Domain age is a signal, not a verdict. A startup that registered its domain last week has a legitimate email. Use domainAgeDays to adjust confidence, not to categorically block.

Technical details

Domain age is retrieved from WHOIS records at query time and cached for 24 hours per domain. The cache is shared across all OhBounce.ai customers, so if another customer validated an address on the same domain recently, you benefit from the cached lookup at no extra latency cost. The field is included on every validation response with no additional charge.