Comprehensive Email Verification
Verify emails with spam risk scoring, catch-all verification, and unlimited usage. Protect your domain and improve reply rates today. Try 1,000 emails free.
Allegrow goes beyond basic validation with unlimited verifications, contact-level catch-all verification, advanced risk scoring, and automatic removal of risky contacts from Outreach, Salesloft, and Closer CRM. Protect your domain and boost outbound performance without relying on outdated validation methods that return inconclusive “risky” or “unknown” results, and without the limitations of credit-based pricing.
What is Email Verification?
A critical step for Outbound Sales
Email verification is the process of checking whether an email address is safe to send to, not just whether it “exists,” but whether it poses a risk to your sender reputation. For B2B teams running high-volume outbound campaigns, this means identifying more than just typos or formatting errors. It means detecting spam traps, silent bounces, and contacts that could trigger domain-level penalties.
Allegrow is designed specifically for this type of risk ensuring your emails reach real active B2B contacts, not spam traps or blacklists.
Validation vs. Verification: What’s the Difference?
Most tools that offer “email validation” only check if an address looks correct or responds to a server ping, but that’s not enough to keep your messages out of spam.
Email verification generally goes further. Allegrow performs email verification built for real deliverability. That means determining which specific emails on catch-all domains are safe to send, spam traps, or contacts that silently bounce, all before your message goes out.
The result? Fewer bounces, emails only being sent to active contacts, stronger domain reputation, and more replies from the leads you care about.
Note on catch-all email verification: Many legacy providers claim it’s impossible to verify whether an email on a catch-all server is valid. That’s not true. It’s impossible using legacy methods, but Allegrow has a modern deep verification method that provides highly accurate, reliable verification on catch-all emails.
Why Choose Allegrow’s Email Verification?
Unlimited Verification — No Credits, No Limits
Most email verification tools make you buy credits or pay per lookup. Allegrow gives your entire team unlimited access to email verification so you can clean your lists more frequently, recheck old leads before reactivation, and get more revenue from freshly cleaned email data as a result.
We made this change because we realized that to unleash the full power of email verification, users need to stop worrying about credits and start getting results.
With outbound data decaying by 30% every year, regular re-verification is essential to prevent you from hitting spam traps and preserve your domain reputation. Unlimited usage means you never hesitate to keep your pipeline clean.
Catch-All Detection and Advanced Risk Scoring
Allegrow identifies dangerous emails others miss, like invalid emails on catch-all domains, spam traps, and dead emails (which would otherwise produce silent bounces). We have multiple proprietary methods and data sources to provide you with a definitive result on whether an email is really valid or not. Rather than just disregarding data as “catch-all,” “risky,” or “unknown.”
Seeing as catch-all contacts can make up to 40% of a B2B email lists, this means you’re able to reach valid contacts that were previously disregarded (if you didn’t email any catch-alls). These contacts are also emails that typically get contacted less often due to their catch-all server, meaning a less competitive inbox.
On the other hand, if you previously sent to catch-all emails that your legacy verifier doesn’t truly verify. Now, removing spam traps from this segment of the list protects your domain from being classified as spam, meaning you hit the primary inbox and generate more leads.
Integrated Safety Net That Protects Your Sending Tools (+API access)
Allegrow’s Safety Net integrates directly with your sales engagement tools like Outreach, Salesloft, and Closer CRM to automatically remove high-risk contacts from active cadences and sequences.
In addition, data providers and AI app builders can use Allegrow’s custom API to programmatically risk analyze emails from their dataset. Book a demo with our team to discuss these custom API packages.
No manual list cleaning. No last-minute checks. Just seamless, ongoing protection that prevents your team from sending to contacts that could bounce, trigger spam complaints, or damage your domain.
You stay focused on selling and building. We handle the risky data.
How it works
Step-by-Step Email Verification Flow
When your team adds contacts to a cadence or uploads a list, Allegrow automatically verifies each email address through a multi-step verification process designed to protect your domain, reduce bounce rates, and keep your outbound pipeline clean.
Although we can’t share all the proprietary details behind Allegrow’s methodologies, we can share a few summary points to give you an overview.
Step 1: Basic Syntax
We start with the basics. Allegrow confirms that each email address is correctly formatted to filter out typos, invalid characters, and fake inputs — the first layer of defense against obvious errors.
Step 2: MX and SMTP Checks
Next, we verify whether the domain has valid mail exchange (MX) records and responds correctly to SMTP handshakes. This confirms the domain is active and able to receive mail, beyond what a basic “ping” validator would do.
Step 3: Catch-All & Silent Risk Detection
Here’s where Allegrow truly differs. Instead of simply flagging a domain as “catch-all,” we apply a proprietary verification method to determine which specific addresses on catch-all domains are safe to send to vs incorrect emails. This process doesn’t involve risky test sends or guesswork based on syntax. It’s built on alternative verification methods that are significantly more accurate than legacy verifiers. Meaning you catch spam traps, hidden threats and invalid contacts that legacy tools miss.
Step 4: Per User Spam Rating
Allegrow knows it’s not enough for mailboxes to only send to valid contacts. You need to know which senders and domains inside your business have the highest spam rating, so any issues with their sending can be addressed. So on Allegrow, we provide you with sender reputation data, spam rating, and an email health leaderboard for each sender.
Step 5: Rinse and Repeat — Unlimited Verifications
Contact risk status changes very often. That’s why Allegrow includes unlimited verification — so your team can recheck contacts weekly, monthly, or before every campaign without worrying about credit usage. The result? Fewer dead ends and more replies from qualified leads.
Built for B2B Contact Data
Allegrow is purpose-built for B2B contact data, which is why you’ll find these proprietary verification methods from us that aren’t available on legacy verifiers which were mainly built for the B2C market. Whether you’re on the front lines as a seller, managing systems, or building an application using B2B contact data, Allegrow helps protect your domain, clean your data, and get more replies without changing how you work.
Sales Teams
For SDRs who need confidence that messages are actually reaching prospects. Allegrow helps you avoid wasting time on leads that bounced, landed in spam, or silently failed — so you can focus on contacts who’ll respond.
Data providers & AI builders
For teams managing large datasets or powering automated workflows, Allegrow offers programmatic access to contact-level risk scoring and spam trap detection. Whether enriching leads, training LLMs, or cleaning data pipelines, Allegrow’s API ensures you're working with safe, verified emails that won’t compromise downstream performance or client outcomes.
Sales Operations
Designed for sales ops teams who manage deliverability at scale. Allegrow gives you the tools to monitor risk metrics, automate verification, and prevent spam placement before it disrupts performance.
Leadership Teams
For executive teams responsible for domain reputation and revenue. Allegrow eliminates the risk of outbound damaging your company’s email infrastructure, keeping existing customer comms safe while pipeline keeps moving.
Results You Can Count On
Proven Impact on Deliverability and Pipeline
Allegrow helps B2B sales teams turn email verification into revenue protection. By preventing bad sends, spam placement, and silent bounces, customers see measurable gains in both reply rates and deliverability performance.
- Bounce rates reduced by up to 50%
- Reply rates increased by 200-300%
- Sender reputation increased to 95%
These aren’t marketing stats, they’re from real sales teams managing heavy volumes of outbound emails every month.
What Customers Are Saying
Booster – Email Efficiency & Deliverability at Scale
“Our bounce rate dropped by 52% in Q2 this year and dropped by a further 26% in Q3, which is great. [...] When we look overall, too, at just our reply rates, our click rates, our open rates – they've all improved looking at the quarters we've worked with Allegrow this year, compared to last year. For example, our response rate improved by 80%.”
— Lindsay Minnema, Sales Enablement Specialist at Booster
Workvivo – 3X Reply Rates with Improved Sender Reputation
“With Outreach campaigns, we’ve seen our reply rates increase by 200–300% using Allegrow to optimize inbox placement. Over the same period of this improvement, we’ve also seen Allegrow has taken our sender reputation score from between 50%–70% to currently 94%.”
— Richard Mullins, Head of Global Business Development at Workvivo
Spring Labs – Eliminating Spam Folder Risk
“The biggest issue we had was that employees who were even emailing current clients were still landing in the spam folder. [...] Before, we had a lot of worries about our Head of Product sending a bottom-of-funnel lead some key information and it was going to spam.”
— Alexander Kogan, Director of Finance at Spring Labs
Platform Integrations
Syncs Where Your Sales Team Works
Allegrow integrates directly with your sales engagement platforms and CRM to automate email risk detection across your entire outbound workflow. Risky contacts are flagged and removed from sequences in real time, before your reps hit send, while your CRM stays clean without manual list reviews. These integrations ensure your sender reputation stays protected, even at scale.
Supported Integrations:
- Outreach
- Salesloft
- Close CRM
- Bulk CSV upload
- More on their way
Need a custom API or integration? Talk to our team!
Frequently Asked Questions
How is Allegrow different from tools like ZeroBounce or NeverBounce?
Most email verification tools rely on SMTP server pings and charge per verification — limiting the quality of B2B results on catch-all servers and how often you can clean your data. Allegrow offers unlimited usage and goes beyond basic validation by verifying individual emails on catch-all domains, assigning contact-level risk scores, and automatically removing high-risk addresses from cadences in Outreach, Salesloft, and Close CRM. No credits. No blanket catch-all/risky results. Just the highest quality B2B email verification you can find.
What’s the difference between validation and verification?
Validation checks if an email is formatted correctly and has a live domain. Verification, the way Allegrow does it, means assessing risk factors like spam traps, silent bounces, and which addresses are real on catch-all servers. Allegrow scores each contact based on deliverability risk, with a focus on B2B contacts, so you can confidently send emails only to safe addresses.
How often should I verify my email list?
We recommend verifying before every new campaign and rechecking your database monthly. With contact data decaying by 30% annually, frequent verification protects your domain and maximizes response rates.
Does Allegrow work with my CRM or sequencing tool?
Allegrow natively integrates with Outreach, Salesloft, and Close CRM. If you use another platform, our team can help build a custom API integration or set up a CSV-based process that keeps your data clean with minimal effort.
Can you really verify emails on catch-all domains?
Yes, but only with advanced methods. Most tools label all emails on catch-all domains as “unknown”, “catch-all” or “accept-all / risky” whether they’re valid or not, since the servers of these contacts say all SMTP ping requests are correct, hiding which ones are real contacts. Allegrow uses proprietary techniques to verify these individual emails at the contact level, analyzing multiple signals to determine which are safe to send. This unlocks valuable contacts others discard, especially since catch-alls can make up to 40% of B2B lists. Allegrow helps you safely reach these leads while avoiding bounces, spam traps, and reputation damage.
Is the free trial really unlimited?
You can verify up to 1,000 emails free — no credit card required. Once you upgrade, Allegrow’s unlimited verification plans remove credit restrictions entirely, allowing your team to recheck data as often as needed.