Verifalia Alternative: A Better Way to Validate Catch-All Email Addresses

If you run email validation through an API, there is a good chance you have looked at Verifalia. It has a mature developer experience, flexible quality levels, and a reputation for clean syntax and mailbox checks. For a lot of teams, it is a reasonable default.

The trouble starts when you point Verifalia at a real B2B list. A meaningful chunk of your most valuable contacts come back as “unknown” or land in a low-confidence bucket. Those are almost always catch-all domains, and catch-all domains are exactly where most of your buyers actually work. When a tool cannot tell you whether those addresses are safe, you are left guessing, and guessing is expensive.

This post breaks down where Verifalia is strong, where it leaves you stuck, and why teams running serious outbound move to Scrubby when accuracy on hard-to-verify addresses starts costing them meetings.

What Verifalia Does Well

Let us be fair about the strengths first. Verifalia handles the standard validation jobs competently:

• Syntax and format checks. It catches typos, malformed addresses, and obvious junk before they ever touch your sender reputation.
• MX and mailbox checks. It confirms that a domain can receive mail and, where possible, that a specific mailbox exists.
• Configurable quality levels. You can dial up the rigor per request, which is handy when you want to trade speed for confidence.
• Developer friendliness. The API, SDKs, and documentation are well organized, so integration is rarely the bottleneck.

If your list is mostly major consumer providers like Gmail, Outlook, and Yahoo, Verifalia will verify the overwhelming majority of it with confidence. For that use case, it does the job.

Where It Falls Short: The Catch-All Problem

A catch-all (or accept-all) domain is configured to accept mail for every address at that domain, whether the mailbox exists or not. The server says “yes” to everything during the SMTP handshake, so a standard verification step cannot tell a real inbox from a dead one.

Most validation tools, Verifalia included, respond to this honestly: they mark the address as “unknown,” “catch-all,” or push it into a risky bucket and move on. That is technically correct, but it is not useful. You still have to decide whether to send.

Here is why that gap matters:

• Catch-all is common in B2B. A large share of company domains are configured as catch-all, especially at small and mid-sized businesses. Those are your prospects.
• “Unknown” is not a decision. When 20 to 40 percent of a list comes back unverified, you either send blind and risk bounces, or you suppress good contacts and lose pipeline.
• Bounces compound. Send to enough dead addresses on a catch-all domain and your bounce rate climbs, your domain reputation slips, and even your verified sends start landing in spam.

So the real question is not “does Verifalia work.” It is “what happens to the addresses Verifalia cannot resolve.” For most senders, that pile is where the revenue hides.

How Scrubby Approaches the Same List

Scrubby was built specifically for the addresses other tools give up on. Instead of stopping at “catch-all, unknown,” it runs deeper, multi-step verification designed to return a real verdict on accept-all and risky domains.

The practical difference looks like this:

• Fewer unknowns. Addresses that Verifalia parks as “unknown” come back from Scrubby with a clear valid or invalid result far more often.
• More sendable contacts. Every catch-all address you can confidently keep is a prospect you were about to either bounce on or throw away.
• Protected reputation. By removing the dead mailboxes hiding behind catch-all domains, you keep your bounce rate low and your sender reputation intact.

You do not have to rip out your existing stack to test this. A common pattern is to keep your current tool for the easy 70 percent and route the leftover “unknown” pile through Scrubby to recover the contacts that matter. If you are also running cold outreach and want those recovered contacts to actually convert, pairing a clean list with calendar-first booking through a tool like Kali turns deliverability gains into booked meetings rather than just lower bounce numbers.

Verifalia vs Scrubby: When to Switch

Switching makes sense when the symptoms below sound familiar:

1. Your “unknown” rate is high. If a large slice of your list comes back unresolved, you are leaving sendable contacts on the table every campaign.
2. You sell B2B. Catch-all domains dominate business email, so the catch-all gap hits B2B senders hardest.
3. Bounce rates are creeping up. If deliverability is sliding despite “validating” your list, the catch-all addresses you could not resolve are a likely cause.
4. Suppressing risky contacts is costing pipeline. If you are throwing away unknowns to play it safe, you are paying for caution with lost revenue.

If none of that applies, and your lists are consumer-heavy with low catch-all exposure, Verifalia may be all you need. The point is not that one tool is universally better. It is that catch-all accuracy is a specific problem, and Scrubby is built around solving it.

The Bottom Line

Verifalia is a capable validator for the straightforward cases. Where it leaves you with a pile of “unknown” addresses, Scrubby is designed to turn that pile into clear, sendable decisions, especially on the catch-all domains where your B2B buyers actually sit.

Before your next campaign, take the addresses your current tool could not resolve and run them through Scrubby. If even a fraction come back valid, those are meetings you were about to leave on the table.