Sendtric
CountdownMail
Mailtimer.io
ClickTimer
Airtrics
CodeChemistry.io
Tickdown.email
Countdown timers for your marketing emails

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.

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 | motionmailapp.com | mailboxlayer.com |
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What each product offers, as listed by its team.

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

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

Tracking MotionMail since Mar 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
When comparing MotionMail and mailboxlayer API, you can also consider the following products.

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Eye-catching countdown timers for emails & websites that boost your sales
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Removes invalid emails from your list to prevent email bounces from ruining your deliverability.
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