Hi Sumo-lings!

It’s Ruari, the Co-Founder and CEO of Allegrow, the best email verification platform for surfacing spam traps and invalid contacts at companies that legacy verifiers can’t reveal.

Join us in shaking up the email verification market with the first-ever email verifier to ship unlimited packages at a fixed fee 🚀 (you’ll make credits a thing of the past with our annual unlimited plan option).

As a little background on us, Allegrow has helped thousands of users ranging from fast-growing start-ups to publicly traded companies, recently raised $1 million, and has a new approach for email verification to get B2B companies better results.

Our mission is to help businesses reach the primary inbox (by avoiding spam folders), with the best modern alternative to the legacy email verifiers.

TLDR:

Allegrow uses a new kind of email verification tailored for B2B companies! So you can FINALLY surface spam traps vs valid contacts at catch-all servers that block legacy verification!

We’re here to change the email verification industry as the first provider to ‘kill the credit’ offering UNLIMITED plans at fixed fees! (No credits needed with our bolt-on).

What’s wrong with the old-school verifiers (why you’re still trapped in spam filters…)?

All old-school verifiers only use SMTP checks and other outdated approaches.

This means for B2B contacts, between 25-50% of your results aren't verifiable (and often just state: "catch-all", "unknown", “accept-all”, or "risky."

For high-volume users… this problem gets even worse. The credit-based model punishes you for having a large list and discourages the frequent re-verification needed to keep lists clean, forcing you to use a stale list.

As a result, you either throw away these very valuable chunks of your list or email these contacts and hit spam traps, which lowers your email conversions significantly.

Now, with Allegrow, you can actually verify which individual emails are correct on catch-all servers. Meaning you avoid spam traps and reach those prospects everyone else can’t.

How do we make this work?

Allegrow was built specifically for B2B teams that sell to companies with tough spam filters that block legacy verifiers. (Not B2C like most verifiers).

Our method for doing contact-level verification on catch-all servers is completely different from how legacy verification systems work.

Although we can’t share the entire method for revealing dead emails and spam traps in one post.

We can clarify – we don’t use SMTP checks, there’s no guessing based on email format, and we aren’t sending emails to see what bounces back!

This means you can target the most valuable contacts while avoiding spam traps.

Finally, for high-volume users, we’re the first provider to offer unlimited verification packages, allowing you to verify more frequently without ever worrying about credits again.

Spam filters are getting smarter every day….It’s time to help everyone get smarter with how they verify email.

What are past projects, failures, or successes you’ve had in your career?

1. Back in 2019, we built direct software as a GDPR compliant marketing automation application (same founding team). We learned about B2B contact data from an ESP perspective and realized how widespread the problem of spam traps landing emails in spam was. This application did 100s of thousands of dollars in revenue, but we saw that deliverability was the larger market opportunity.

2. In 2021, we launched Allegrow (including the neverspam app) to help emails reach the primary inbox. Working with companies of all sizes from start-ups to publicly traded companies, we know how to get emails to the primary inbox. The business is now doing over a million dollars in revenue and recently raised a fresh round of venture funding.

3. Now, in 2025, we are focusing our business on email verification that disrupts the legacy approach and gets customers better results ( specifically for B2B organizations). Being the provider that will work best with AI agents, GTM teams at scale, and data providers.

What 3rd party tools is your product critically dependent on?

n/a

Where is your customer data stored?

Amazon Web Services, Ireland / eu-west-1 region

How many customers do you have today?

100s of paying customers and thousands of users.

What’s the origin of the idea for your product?

While building a software product to automate emails, we noticed everyone had issues with cleaning B2B data to avoid spam traps and dead emails. The existing solutions in the market were not specified for B2B organizations (as their biggest customers are companies like large B2C orgs), which meant they missed the mark on a lot of contacts, like companies using catch-all servers. We’re passionate about the product because we know that when people can’t get their messages to the primary inbox: They lose sales, They miss job opportunities, and They can’t communicate with their customers effectively. We can help a lot of people and create a positive impact on their lives by making email better.

What problem is your product solving and how?

All old-school verifiers only use SMTP checks and other outdated approaches. This means for B2B contacts, between 25-50% of your results aren't verifiable (and often just state: "catch-all", "unknown" or "risky" As a result, you either throw away this very valuable chunk of your list, or email these contacts and hit spam traps, which make all your other emails less successful. Now, with Allegrow, you can actually verify which individual emails are correct on catch-all servers. Meaning you avoid spam traps and reach those prospects everyone else can’t. For you, this means more email success and a better business without throwing away cash on the old-school pay-per-credit model.

What’s the #1 thing you’re looking to gain from the AppSumo campaign?

Word-of-mouth!

What are your plans with the customers, cash, and learnings from the AppSumo campaign?

We’ll have a thriving community of deliverability experts, while reinvesting the deal proceeds in pushing the boundaries of what’s possible with email verification at scale.

Any details to clarify about the deal?

On the unlimited plan, bolt-on our fair usage terms apply (it’s not intended for data resellers), and it includes SMTP-based verification to replace the per-credit approach (if you use an existing verifier): https://www.allegrow.co/fair-use-policy

The tier one and tier two plans include catch-all verification, at the limits specified, and we do offer unlimited options for this directly on larger plans.

If you are in the business of reselling leads or data, we can work with you, but you’ll need to contact us directly (it’s not what this AppSumo deal is meant for).