Case Study: Herold improves email list quality and automates filtering with WhoisXML API Email Verification API

Herold & WhoisXML API Improving and Automating Email Filtering with Email Verification API

Herold, the Austrian expert in online marketing services for SMEs, needed to improve email data quality to reduce bounce rates, protect sender reputation, and avoid delays in customer communications caused by outdated or invalid email addresses. To address this challenge, Herold used WhoisXML API’s Email Verification API to support its email validation and filtering process.

With WhoisXML API’s Email Verification API, Herold automated bulk email verification and made faster decisions about invalid addresses, helping the team continuously clean and improve email lists. The results included a stabilized bounce rate below 5% and a 70% reduction in response time to email delivery problems, improving overall data quality and operational efficiency.

HEROLD

Oleg Danilov

Director of Marketing Services - Sales Excellence & Data Management