Who Hosts Their Email? Free Email Provider Checker
Tool demo · Email Provider Checker
A short walkthrough of the free WarmInboxes email provider checker: enter a domain and see whether its mail is hosted by Google, Microsoft, another provider or behind a security gateway.
Email Provider Checker
Find out who hosts a domain’s email — Google, Microsoft, Zoho, or a security gateway — from one lookup.
Run the Email Provider Checker → Free, no account.