Spend $0 to clean your email list 💌
Hi!
If you're sending marketing or cold emails, you will love this email validator – https://sidemail.io/tools/email-validator/
Nothing ruins a campaign like poor deliverability. Bad email addresses drive up bounces, hurt your sender reputation, and lower open/reply rates.
Email validator is what helps you avoid this.
But most of the tools like this hide behind signups and paywalls.
I wanted a no-signup, in-browser checker you can use fast. So I built it, and you can use it too.
It’s free and online.
Useful
Thanks!
This is super useful! Thanks for creating a free and accessible email validator. Poor deliverability is a killer for any email campaign.
That's right! You're welcome :)
Nice one. Do you have an API that can be used to validate a bunch of emails at once?
For bulk validation, I made a list validator – https://sidemail.io/tools/email-list-validation/. You upload a CSV with addresses to validate, and it performs the validation + you can export a CSV with results.
If you prefer returning a CSV cleaned out of the invalid addresses, you can use https://sidemail.io/tools/email-list-cleaner/
I don't have an API atm, but I was thinking about it too, actually.
This is awesome, Kristyna! 💌 Simple, no-signup tools like this are such a breath of fresh air — especially for people running small campaigns or testing deliverability before scaling.
Love that you focused on accessibility and speed — that’s what makes a tool truly useful. Great job! 👏
Thank you! I appreciate your kind words :)
Yes, you're right! And I'm happy to help people like these.
Out of curiosity, how do you plan to monetize this?
I have no plans for monetization of this tool – I created it as I wanted a quick and free validator that anyone can use.
Plus, I enjoy helping others with email related stuff and believe in giving something free to the community (we run a platform for delivering SaaS emails, it's our main product – https://sidemail.io/)
Very useful!
Thanks! Feel free to share it with your friends who might benefit from it too :)
Tried it earlier today, and it actually works really fast. Most email checkers make you sign up or limit the free checks, so this one's pretty handy when you just need to clean a quick list. Nice work.
Exactly! It's exactly why I built it – I wanted something that I could use quickly, no sign ups. I'm happy you like it too!
A clean list is the absolute foundation. Once its clean the next move is sending personalized messages at scale to actually book meetings. We've used this to help a web design agency get 10 new clients in just 3 months.
Happy to go for a partnership here :)
Yes, exactly!
It's great! Are you somehow automating the process or sending the emails manually?
we are automating the process. Only parts of of the copy, optimizing & monitoring is made by a human :)
That makes sense :) Would you mind sharing some tips about your process and what tools work best for you?
The honest answer is that it's less about individual tools and more about how the entire system is integrated, from the initial lead sourcing and data enrichment to the specific messaging frameworks we use. Typing it all out would be an essay, but I could probably show you the entire workflow in about 15 minutes on a quick screen share. Open to a brief call sometime this week to walk you through it? https://cal.com/colin.prospect/strategy
Do you have any other tips to increase the chances of getting the emails opened? I'm all ears!
And if you have any ideas or questions regarding the validator tool, please do tell :)