Free email deliverability tools.

Verify your SPF record syntax, count DNS lookups, and catch authorization gaps before your emails fail authentication.

Look up your DMARC record, read your policy and alignment, and see whether your domain is actually protected from spoofing.

Look up your DKIM record by selector, confirm the public key is published, and check your signing setup.

Look up a domain's mail servers, see their priorities, and identify the email provider behind any domain.

Look up all of a domain's core DNS records - A, AAAA, MX, NS, and TXT - in one place.

Look up a hostname's CNAME record and see exactly what it points to.

Check the reverse DNS (PTR) record for any IP address - sending IPs without one are treated as suspicious.

Check a domain's registration date, age, registrar, and expiry - domain age is a real deliverability signal.

Check whether your domain publishes a BIMI record so your logo can appear next to your emails.

Check whether your domain or sending IP is listed on public email blacklists that could be hurting deliverability.

Get a quick reputation read on your domain from its authentication posture, mail setup, and public blacklist status.

One domain, one score. Check SPF, DKIM, DMARC, MX, and BIMI together and get a 0-100 deliverability score with prioritized fixes.

Check a domain's SSL/TLS certificate - issuer, validity dates, and how many days until it expires.

Validate an email address: syntax, the domain's mail servers, and disposable or role-based patterns - no risky SMTP probe.

Work out how many mailboxes and domains you need to hit your daily sending target safely.

Estimate pipeline and revenue from a cold email campaign based on volume, reply rate, and close rate.

Estimate how long it takes to warm a new mailbox up to your target daily sending volume.

Calculate your email open rate and see how your campaign compares.

Calculate your click-to-open rate (CTOR) to measure how compelling your email content is.

Calculate your spam complaint rate - stay under the thresholds that get you blocked.

Calculate your bounce rate and see whether your list hygiene is putting your sender reputation at risk.

Build a valid SPF record by picking your senders and enforcement level - copy the DNS TXT record and you're done.

Build a valid DMARC record - choose your policy, add reporting, and copy the DNS TXT record.

Generate a DKIM public/private key pair and the DNS TXT record to publish for your selector.

Build a clean, professional HTML email signature and copy it straight into your mail client.

Paste raw email headers to trace the delivery path and read the SPF, DKIM, and DMARC results.

Paste a DMARC record to see every tag explained in plain English.

Count the DNS lookups in an SPF record and see exactly where you're burning your 10-lookup budget.

Paste your email copy to flag spam-trigger words and get a quick spam-risk read before you send.