Email deliverability for B2B sales teams
Where the addresses come from
- Pattern-guessed addresses, derived from a company's naming convention and a person's name on LinkedIn.
- Data providers and enrichment tools, which are themselves guessing and occasionally selling the same guess back to several customers.
- Inbound leads from forms, the smallest and highest-quality source in most pipelines.
- Conference and trade show lists, where the consent story is weak and the addresses are often transcribed from badges.
The hard cases are the whole list
Cold outreach targets business domains, and business domains are where checking works least well. Around 28% of a 10,000-email B2B benchmark sat on catch-all domains where no mailbox can be confirmed by anybody.
Add Microsoft 365 tenants with recipient validation disabled, security gateways answering on behalf of the mail system, and Google Workspace domains with a default recipient set up, and a large minority of any cold list is structurally unverifiable.
Sending from a domain you cannot afford to lose compounds it. A cold program run from the company's main domain puts every internal and customer email behind the same reputation.
What the results tend to look like
The hardest mix in this list. High catch-all, high role address, and a meaningful invalid rate from pattern guesses that were wrong. A cold B2B list will return the lowest coverage of anything you run through a checker, and a vendor reporting otherwise is inferring.
What to do about it
Send cold outreach from a separate domain
A domain you can afford to lose, warmed separately. Your main domain carries internal mail and customer contact and should never be behind a cold program.
Segment catch-all addresses and send to them last
They are unresolvable rather than bad. Sending to confirmed addresses first establishes a pattern before you introduce the risky share.
Measure invalid rate by data source
Pattern guesses, enrichment vendors and form fills produce very different quality, and the comparison prices your data suppliers honestly.
Keep role addresses and judge them separately
At a small company info@ is often the right contact. At a large one it is a shared mailbox nobody reads. The company size decides, not the prefix.
Questions people ask
Why is B2B checking coverage lower than consumer?
Because business domains are far more likely to accept every recipient, whether through an administrator setting or a security gateway in front of the tenant. Nobody can confirm a mailbox behind that.
Should catch-all addresses be removed from a cold list?
No. Many are real and some are your best prospects. Segment them, send to them after your confirmed addresses, and accept a higher bounce rate on that portion.
Are guessed addresses worth verifying?
Yes, and they will produce a high invalid rate. That is useful information about your guessing patterns rather than a fault in the check.
Related sectors
See the breakdown on your own list
100 free checks a month, no card. Addresses we could not get an answer on come back labeled rather than guessed at, and we do not bill them.