About SenderMap

SenderMap is a free, no-signup tool that decodes how any domain is wired for email.

We resolve DNS, MX records, SPF, DKIM, DMARC and BIMI policies, identify the email service provider (ESP), the hosting provider and ASN, and surface WHOIS metadata — all in one clean view.

Who it's for

• Deliverability teams verifying authentication posture before a campaign.
• Security teams auditing partners, vendors and look-alike domains.
• Infrastructure engineers mapping out a domain's real stack in seconds.
• Sales and BD doing tech-stack research on prospects.

What we don't do

We do not store the domains you look up, we don't require an account, and we don't test deliverability. For inbox-placement testing across Gmail, Outlook, Yahoo and others, we recommend MailAnalyze.