Legacy APIs fail on 30% of B2B email traffic, marking valid leads as "Unknown" or missing spam traps. Allegrow’s signals-based infrastructure solves Catch-alls and navigates SEGs so you can deliver data your clients trust.
Verify 1,000 contacts for free with enterprise-grade accuracy.
Legacy verifiers can’t solve catch-all servers, marking ~30% of your data as "Unknown". This forces you to discard sellable inventory or deliver low-confidence data to your customers, limiting your coverage and revenue potential.
Simple SMTP checks fail in the hostile B2B environment. They get blocked by SEGs (Proofpoint/Mimecast) or tricked by catch-alls. When you sell a "Valid" contact that burns your client's domain, they don't just complain—they cancel.
If you rely on the same legacy verification as your competitors, your data becomes a commodity. You can’t verify the difficult contacts that premium buyers pay for, forcing you to compete on price rather than exclusive coverage and quality.
Allegrow is the specialized verification layer that sits between your raw data and your customers, resolving catch-alls and neutralizing domain reputation threats at scale (millions of requests/day).
Build a seamless integration that matches your product's tempo. Securely manage multiple environments with Unlimited API Keys and select Custom API Speeds for synchronous (real-time user-facing) or asynchronous (bulk enrichment) implementations.
Don't settle for black-box verification. Customize your preferred mix of standard syntax/SMTP vs. our proprietary signals-based methods to resolve "Unknown" results and hidden threats (spam traps, manual reporters) to eliminate false positives. This flexibility allows you to balance speed and depth, extracting the maximum number of valid leads for your customers.
Improve your margins as you grow. Access Custom Pricing starting at $900 per million requests, ensuring your economics stay healthy. By delivering cleaner data with higher coverage, you also prevent the downstream reputation damage that causes client churn.
Legacy tools are blind to the reality behind a catch-all server, resulting in "Unknown" gaps or dangerous false positives. In this technical breakdown, see how Allegrow’s signals network definitively resolves these contacts, ensuring you only deliver accurate, validated data.
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Run a side-by-side test on your hardest data. Free.
"One problem we saw Allegrow could solve [...] was creating quality assurance around how fresh our email contact data is. For Example, there’s data that could have come into our CRM and been fresh at the time, but if reps are re-prospecting old accounts [...], this could easily turn into emails that bounce. [...] Allegrow will analyze this data and make sure those bounces are avoided. This was a unique and powerful capability that no one else offered."
"In the first 12 months, using the Safety Net (SN), we prevented 75,000 harmful contacts from entering cadences, which helped safeguard our domain reputation. [...] which led to us almost doubling email send volume while keeping bounce rates below 2%. We’ve also managed to stay on top of our sender reputation score, which has reached 97%"
"I strongly believe if you don't have a product to monitor and improve inbox placement, your investment in other technologies like ZoomInfo and Outreach is wasted because your reps' messaging isn't being seen [...] With Outreach campaigns, we've seen our reply rates increase by 200-300% using Allegrow."
You can, but simple SMTP checks are no longer enough for corporate mailboxes. To reliably identify threats hidden behind B2B servers, you need a signals-based system. Building this internal logic isn't a one-time sprint; it requires massive datasets and a permanent maintenance tax just to keep up with changing server responses and firewall rules. Partnering with Allegrow prevents your team from spending cycles fighting reputation blocks instead of building your core product.
Legacy tools rely on server responses alone, which fail on catch-alls. Allegrow supplements this process by analyzing 30+ risk signals (digital footprint, engagement history, network data) to identify both valid and risk contacts, even if they are hidden behind SEGs and catch-all servers that don't offer a reliable SMTP response.
We are built for data providers. We support millions of verifications per day with high-concurrency architecture. We offer custom rate limits and dedicated technical support for high-volume enterprise partners.
Never. Sending fake emails to verify accounts is a dangerous practice that burns your IPs and damages sender reputation. Our signals-based approach is passive and safe, ensuring zero risk to your infrastructure.
Yes. This is our core differentiator. Our infrastructure is specifically designed to navigate and verify contacts behind strict Secure Email Gateways (SEGs) like Proofpoint and Mimecast that block standard verification methods.
You will receive immediate platform access to benchmark your current lists and validate our accuracy firsthand. Simultaneously, a deliverability specialist will reach out to schedule a technical deep-dive with our engineering team, ensuring all your API and infrastructure questions are answered by a technical peer.
Your current API is hiding valid leads and missing threats with false positives. Let's prove it. Request your API consultation and get access to our platform to run a side-by-side comparison on your hardest data.