CampaignKit is described as 'Use our Email Validation Service to clean your email lists. Reduce bounces and remove low-quality contacts to protect your sender score. Improve your email marketing performance. Remove invalid email addresses, and spam from your email lists' and is an app in the development category. There are more than 10 alternatives to CampaignKit for a variety of platforms, including Web-based, Self-Hosted, SaaS, PHP and Go (Programming Language) apps. The best CampaignKit alternative is Bounceless. It's not free, so if you're looking for a free alternative, you could try BounceBan or Reacher. Other great apps like CampaignKit are Automated Emails, NeverBounce, DeBounce and Clearout.
Null Bounce is an email validation tool that helps companies decrease the bounce rate for email campaigns. Also, the service is available as an API, which can be used, for example, on sign-up forms to ensure that user submits a valid email address.
