Email Provider Lookup
Enter any domain to identify its email provider. No signup required.
Please enter a valid email (user@company.com) or domain (company.com)
What this tool detects
This free lookup queries the domain's MX and SPF records to identify the email provider powering it. It distinguishes between 150+ providers including Google Workspace, Microsoft 365, Zoho, Fastmail, OVH, and more — and flags security gateways such as Proofpoint, Mimecast, or Barracuda, with the mailbox provider behind them when SPF reveals it.
Unlike email verification, this tool never contacts the mail server. It performs passive DNS analysis only — safe, fast, and GDPR-compliant.
Need more than 5 lookups?
Checking prospects one by one? Upload a CSV and get the mailbox provider and security gateway of every address. 100 lookups/month free.
Get Free API KeySending to this domain? Check whether a security gateway filters it →