Email deliverability and domains: free website tools
7 free email deliverability and domains tools for anyone sending business email or managing a portfolio of domains: EmailAuthPulse, ColdEmailDomainWarmerAudit, DnsBlacklistPulse, B2BDomainSignalVerify, DomainRdapPortfolioAudit, LookalikeDomainWatch, SslExpiryPulse. Each runs a live, read-only scan with the full result free; fix packs and monitoring are optional.
7 free, read-only checks for anyone sending business email or managing a portfolio of domains. Run any of them on your own site; each shows a score, every check it ran and what to fix.
EmailAuthPulse
A free, read-only check of the DNS records Gmail, Yahoo and Outlook use to trust your mail: SPF, DKIM, DMARC, MX and BIMI. Nothing is sent and nothing is changed.
Free scan · fix pack $4.99, monitor from $9/mo · try the demo
ColdEmailDomainWarmerAudit
For sales teams sending from a secondary domain (like getacme.com). We check SPF, DKIM, DMARC, MX for replies, the website redirect to your main brand, domain age, reverse DNS and public blocklists, then write the DNS records and a compliant ramp-up checklist.
Free scan · fix pack $4.99, monitor from $9/mo · try the demo
DnsBlacklistPulse
A free, read-only deliverability check of the DNS behind your mail: MX, reverse DNS (PTR) with forward confirmation, MTA-STS, TLS reporting, SPF and DMARC presence, and public blocklist listings for your mail server IPs.
Free scan · fix pack $4.99, monitor from $9/mo · try the demo
B2BDomainSignalVerify
Check up to 25 company domains at once before you import a lead list or approve a signup. For each domain we read public DNS and the website: mail servers (MX), the email provider (Google Workspace, Microsoft 365, Mimecast, Proofpoint and more), SPF and DMARC strictness, disposable or free-mail domains, and whether the company website is live.
Free scan · fix pack $4.99, monitor from $29/mo · try the demo
DomainRdapPortfolioAudit
Check up to 25 of your domains at once. For each one we read the official registry record (RDAP): expiry date, registrar, transfer and update locks and DNSSEC, then check that the domain resolves, that CAA records limit who can issue certificates, and how many days are left on its TLS certificate. A monitor plan re-checks daily and emails before anything expires.
Free scan · fix pack $4.99, monitor from $9/mo · try the demo
LookalikeDomainWatch
Enter your brand domain. We search public Certificate Transparency logs for certificates issued in the last 90 days to other domains that contain your brand name, use it on another TLD or in a subdomain, or use internationalized (possible homoglyph) names. On a monitor plan, new ones are flagged daily.
Free scan · fix pack $4.99, monitor from $19/mo · try the demo
SslExpiryPulse
A free, read-only check of your TLS certificate: days until expiry, hostname match, trusted chain and protocol version. One handshake, nothing else.
Free scan · fix pack $4.99, monitor from $9/mo · try the demo
Other tool groups
AI search and AI-agent readiness Technical SEO Security, privacy and trust Conversion, signup and pricing Competitive and sales intelligence Performance and design Agencies and local business sites Newsletters and podcasts
Frequently asked questions
Are these email deliverability and domains tools free?
Yes. Every scan and its full result are free. An optional fix pack (copy-paste fixes for the failing checks) and monitor plans that re-check on a schedule are paid.
Do the tools change anything on my site?
No. They are read-only: they request public pages, files and DNS records the way a browser or mail server would, and never submit forms or log in.
Which email deliverability and domains tool should I start with?
Start with EmailAuthPulse; each result page links to related checks.