Based on our record, Email List Verify seems to be more popular. It has been mentiond 2 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.
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: over 1 year ago
Emaillistverify.com is the service I use. Source: over 1 year ago
Hunter - Find all the email addresses related to a domain
NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
Snov.io - More leads. More sales. More revenue.
ZeroBounce - Removes invalid emails from your list to prevent email bounces from ruining your deliverability.
MailDump Verifier - Powerful Emails Verifying Tool that helps verify email address or validate email addresses
Email Verifier - Email verifier app lets you verify email.