Spam traps

What they are and how to keep them off your list.

This guide is part of the CorrectInbox knowledge base. The full article content is populated from our CMS in production; the page structure and styling here are final.

The short version

CorrectInbox specializes in resolving catch-all Microsoft 365 and Google Workspace domains accurately — and returning a confidence score instead of a blind guess when an address genuinely can't be resolved.

How CorrectInbox handles it

Our verification engine combines syntax, MX, and SMTP signals with a dedicated catch-all resolver. Results map to four honest states: valid, invalid, catch-all, and unknown — each with a confidence score you can threshold against your own risk tolerance.