Based on our record, CampaignKit seems to be more popular. It has been mentiond 3 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
End of 2021 I started campaignkit.cc. An Email validation service. I build the first version within a week and put it online. Started some advertisements on Reddit and Twitter. First people started to use it. Source: over 1 year ago
You can try my email validation service: http://campaignkit.cc/. Source: almost 2 years ago
I’m the creator of https://campaignkit.cc and might be a little bit biased though. Source: almost 2 years ago
ZeroBounce - Removes invalid emails from your list to prevent email bounces from ruining your deliverability.
Sender Policy Framework - This is a diagnostic tool that acts as a Sender Policy Framework (SPF) record lookup
NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
MailRefine - Decrease Email Bouncing With Best Email Verifier
TrueMail.io - TrueMail.io is an email checker service.
KIRIM.EMAIL Transactional - Single pricing transactional email & email marketing -no recurring fee