Based on our record, Email List Verify should be more popular than Klipfolio. 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 those excel files change over time, ask the maintainers to upload in to cloud and add all those excel files as data source in klipfolio (klipfolio.com) and create a dashboard there. Your creation will last forever (as long as the structures of those files last). Source: over 2 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
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