Wise Squad
Outbound systems for B2B companies and agencies.
Method: Clay waterfall enrichment. Emails verified: 5,000+
“The biggest value isn’t just verification accuracy — it’s recovering contacts that would otherwise stay unused.”
The Setup
The team builds outbound systems for B2B companies and agencies. The lead generation workflow runs through Clay with waterfall enrichment — every additional verified email directly translates into more opportunities for their clients.
For a long time the stack included NeverBounce alongside several other providers for email verification. Standard verifications worked well. But catch-all domains almost always remained unresolved — and nobody questioned it because that’s what every tool did.
15-20% of Every List — Unusable
At scale, unresolved catch-all emails represent a significant portion of any lead list. Most verification providers return them as “unknown” and move on. Two bad options follow: skip them and lose the contacts, or email them blind and risk bounces.
Typical lead list before filtrat
One Capability Changed Everything
After several months and 5,000+ email verifications, the difference became obvious. On the exact same lead lists, filtrat consistently resolved catch-all emails that the previous stack left as unknown.
The Numbers
Catch-All Contacts May Be Better Leads
Catch-all addresses often generated healthy reply rates. The working theory: these inboxes receive less outbound traffic than typical business emails because everyone else’s verification tool told them to skip.
“Catch-all inboxes receive less cold outreach because every other tool tells you to skip them. Less competition = higher reply rates.”
From Multiple Providers to One
- NeverBounce for primary verification
- Additional providers for coverage
- Catch-all returned as "unknown" across all tools
- 15-20% of every list discarded
- One provider for verification + catch-all resolution
- Same lead lists, 15% more verified contacts
- Catch-all resolved to definitive status
- Recovered contacts included in campaigns with healthy reply rates
Key Numbers
Takeaway
The switch wasn’t about replacing a broken tool — NeverBounce worked fine for standard verifications. The switch was about recovering the 15% of every list that every tool left on the table.
When outbound runs through Clay with waterfall enrichment, every additional verified email is another shot at a meeting. An extra 15% of reachable prospects from the same data, at the same sourcing cost, without adding complexity — that’s what made filtrat the default.
The unexpected bonus: catch-all contacts may actually be better leads because fewer competitors can reach them.
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