
NeverBounce
Kickbox
ZeroBounce
Email Checker
Email List Verify
Email Verifier
emailvalidation.io
Mailboxlayer is a free, simple and powerful JSON API offering instant email address validation & verification via syntax checks, typo and spelling checks, SMTP checks, free and disposable provider filtering, and much more.
Sendtric
CountdownMail
Mailtimer.io
ClickTimer
Airtrics
CodeChemistry.io
Tickdown.email
Countdown timers for your marketing emails

Which is more popular?
Based on our record, mailboxlayer API seems to be more popular. It has been mentioned 5 times since March 2021.
Website, pricing, platforms and company facts side by side.
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MotionMail
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| Website | mailboxlayer.com | motionmailapp.com |
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What each product offers, as listed by its team.

Possible disadvantages
Possible disadvantages
Walkthroughs and reviews on video.
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How to add a Motionmail Countdown Timer inside of an email using Flodesk
How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using mailboxlayer API and MotionMail. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.

I've found a few "free" APIs which tell you if the email address exists or not, they have a free tier for certain amount of queries. Try https://mailboxlayer.com and https://www.zerobounce.net. Source: about 4 years ago
What I mean by valid is whether it is deliverable or not. Like this https://mailboxlayer.com/. Source: about 4 years ago
In Inspector we use the mailboxlayer.com API to validate emails. The service is also able to detect fake email addresses, temporary addresses, and the actual existence of an email address using MX-Records and SMTP. - Source: dev.to / over 4 years ago
Tracking MotionMail since Mar 2021.
When comparing mailboxlayer API and MotionMail, you can also consider the following products.

Real-time email verification and cleaning to ensure emails never bounce.
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Easily create animated countdown timers on Sendtric to boost your clickthrough rates and increase sales. Free with no watermarks or account required.
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Verify your email address lists with our drag and drop interface, or integrate into your app with our API. Prevent fake and bot account sign-ups by confirming your users are real humans with a real email address.
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Increase urgency, boost engagement, and encourage sales by enhancing your emails with customized countdown timers.
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Removes invalid emails from your list to prevent email bounces from ruining your deliverability.
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Eye-catching countdown timers for emails & websites that boost your sales
Compare Mailtimer.io to mailboxlayer API or MotionMail: