Based on our record, Sift should be more popular than Email List Verify. 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.
They may be using something like Sift for security checking and something of yours was flagged. Source: over 1 year ago
But sorry to break it to you, this has been done at a really large scale already although most consumers are not aware. One big player here is https://sift.com/ Almost every major retailer uses their service exactly for the reasons you mention. Source: almost 3 years ago
Reddit, for one. A pretty big list on their homepage. Source: almost 3 years ago
If you're not getting the right email addresses from ContactOut and it's bouncing back, you could always run the email addresses through something like emaillistverify.com to make sure they're valid before you try to email them. (you should do that always anyway to protect your email deliverability). Source: almost 2 years ago
Emaillistverify.com is the service I use. Source: almost 2 years ago
Kount - eCommerce fraud detection & prevention
NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
Riskified - eCommerce fraud prevention solution and chargeback protection guarantee for online merchants. Find out how we can help your company boost revenue from online sales using our machine-learning powered eCommerce fraud protection software.
ZeroBounce - Removes invalid emails from your list to prevent email bounces from ruining your deliverability.
Signifyd - Signifyd is a SaaS-based, enterprise-grade fraud technology solution for e-commerce stores.
Email Verifier - Email verifier app lets you verify email.