How to Review Catch-All Email Results for B2B Contacts

A catch_all result means the server accepts any address at the domain, so the verifier cannot determine whether a specific mailbox exists. In a B2B list, record this as an address result, not evidence about the person. ¹

What the result does not establish

The result does not confirm that the address belongs to the named person or that the person still holds the listed role. ¹

It also does not predict whether a message will reach an inbox or receive a reply. A verifier's status is not a substitute for checking whether the person is still a fit for your campaign. ³

Keep the exact status returned. Do not relabel catch-all as “valid” or “invalid” by assumption; use the verifier's own definition. ¹

Review the mailbox and the person separately

Check the person's current role against a company team page or professional profile, and record the source and date. This supports the person's fit for the campaign; it does not change the email result.

Set the send-file rule before reviewing the list. For example, your policy might require both a deliverable result (or the verifier's documented equivalent) ¹ and a current source confirming the person's role. Under that rule:

• Catch-all, role confirmed: hold the address out of the email send file; keep the person for review or another channel.
• Deliverable, role unconfirmed: hold the address until the person's fit is checked.
• Deliverable, role confirmed: eligible for the send file under this example rule, subject to your other policies.

This is an example policy, not a universal rule. A hypothetical review row might read:

[email protected] | catch_all | company team page checked | current role confirmed | hold for email; keep for another channel

Record the result and your decision

Keep the original export unchanged. Add review columns such as:

email | verifier | returned status | checked date | role source | role-check date | decision | reason

Then review each row:

1. Run the intended sending file through a reputable email verifier. RadarLeads also recommends checking an export with a reputable verifier before sending. ²
2. Enter the exact status and the date checked.
3. Check the person's current employer and role independently. Record the source and date, or mark the role unconfirmed.
4. Apply the rule you chose and record a concrete action, such as hold for email or review another channel.

Keep “unknown” separate from “catch-all”

Unknown is a distinct result, not another name for catch_all. Mailgun lists both among its result types and lists SMTP timeouts and errors as separate potential reasons. Keep the exact status and any returned reason in your record. ¹

RadarLeads describes business email with “verification status where available.” Search and preview contacts by role and company, then use your own review process before outreach. ² Create a free account to explore a segment.

Sources

1. Mailgun Documentation, “Single Validation”

2. RadarLeads homepage, “How it works” and email status guidance

3. Reoon, “Why ‘Valid’ Emails Can Still Bounce: What Verification Can’t Guarantee”