Which email provider is behind that domain?
Check one domain or paste a prospect list. See who filters each inbox, Google, Microsoft or a security gateway, and whether SPF, DKIM and DMARC are set up.
Lists are checked by our lookup service and aren't saved. SPF, DKIM and DMARC checks for a single domain run in your browser. The only thing kept is an email address you choose to leave.
The math, step by step
No hidden assumptions. Every number above comes from these steps.
- MX lookupThe domain's MX records show which servers accept its mail.
- ProviderThe MX hostnames are matched to known providers: Google, Microsoft 365, security gateways like Proofpoint and Mimecast, and others.
- Behind a gatewayWhen a gateway sits in front, the SPF record often shows the mailbox provider behind it.
- SPF and DMARCTXT records at the domain and at _dmarc show whether SPF exists and which DMARC policy is set.
- DKIMFor a single domain, common DKIM selectors are checked. A custom selector won't show up.
FAQ
Plans start at $1,500/month. Compare plans.
An MX record tells the internet which mail servers receive email for a domain. It doesn't affect sending. It shows where mail for that domain is delivered and who filters it.
Google Workspace, Microsoft 365 and security gateways each filter mail differently. Splitting a prospect list by provider lets each group get its own sending volume, timing and copy instead of one blast that works for some inboxes and quietly fails for others.
A service such as Proofpoint, Mimecast or Barracuda that screens mail before it reaches the mailbox. Gateways often scan links and attachments, which is why short plain-text first emails tend to do better.
Yes. Enter a single domain to see SPF, DMARC and DKIM. A sending domain should have SPF and DKIM found and a DMARC record in place before you send cold email from it.
No. Domains are looked up and the results are cached briefly so repeat checks are fast, but your list itself isn't saved. The only thing kept is an email address you choose to leave.
Let’s get your next reply.
Tell us who you want to reach. We’ll map the campaign, recommend a plan, and show you what the first month would look like.