Free email deliverability tools
Check that a sending domain is set up the way Gmail, Yahoo and Outlook expect: SPF, DKIM and DMARC records, blacklists, one-click unsubscribe headers and the mail provider behind a domain. Verify one address, read a message's headers, plan an inbox warm-up and see whether Gmail itself has an open incident.
As of 9 Nov 2026, 7,056 of the 58,419 business emails 67Leads holds (12%) were confirmed by the company's mail server.
Updated (the day rows in this list last changed). Counts as of 9 Nov 2026.
The 13 Email deliverability tools
Is my domain ready to send cold email under Gmail and Yahoo's sender rules?
Type a sending domain. Get a yes or no against Gmail and Yahoo's bulk sender rules: SPF (one record, under 10 lookups), DMARC policy and reporting, MX provider, DKIM if you give a selector, and the fix for each failure.Email warm-up schedule planner
How fast can a new inbox ramp up its cold email volume?
Enter your inboxes, a starting volume and a target per inbox. Get a week-by-week ramp, the emails and new leads each week, and how many leads a month you can reach at full volume.CAN-SPAM compliance checker
Does my cold email meet the CAN-SPAM Act's requirements?
Paste a subject, sender name and body. Get a check against the FTC's CAN-SPAM requirements: postal address, opt-out, subject line and sender, plus the process rules no email can show.Email provider lookup
Which email provider does a company's domain use?
Paste up to 10 domains or email addresses. We read each domain's MX records live and name the provider: Google Workspace, Microsoft 365, Zoho, a security filter or a free mailbox.List-Unsubscribe header checker
Do my email headers support one-click unsubscribe?
Paste an email's raw headers. Get a check of List-Unsubscribe, List-Unsubscribe-Post and the DKIM signature against RFC 8058, or generate the two header lines from your unsubscribe URL.DKIM checker
Is DKIM set up on my domain, and is the key strong enough?
Type a domain and, if you know it, the DKIM selector. We look the key up live, or try the common selectors, and check the version, key type, key length, revoked keys and testing mode.DMARC record generator
What DMARC record should I publish, and how do I move to p=reject?
Pick a policy, where reports go and how strict alignment is. Get the TXT record to publish at _dmarc, what every tag means, a staged rollout from p=none to p=reject, and a live read of the record you have now.SPF record generator
What SPF record do I need for the services that send my email?
Tick the services that send for your domain and add any custom include, ip4 or ip6. Get one SPF record, its DNS lookup count against the limit of 10, and a check for a second record already on the domain.Cold email domain name generator
What secondary domains can I send cold email from?
Type your brand or main domain. Get lookalike sending domains such as getbrand.com and trybrand.co, each checked live in DNS so you can see which are already taken.Email blacklist checker
Is my domain or mail server IP on an email blacklist?
Type a domain or an IPv4 address. It is looked up on public DNS blocklists (Spamhaus, Barracuda, SpamCop, SURBL, URIBL and more), with your mail servers' IPs checked too, and how to get delisted from each.Email verifier
Is this email address real and deliverable?
Type one email address. It is checked for format, disposable domains and mail servers, then the mail server is asked whether the mailbox exists and whether it accepts every address (catch-all). Nothing is sent.Email header analyzer
What do my email headers say about delivery, SPF, DKIM, DMARC and spam?
Paste the raw headers of a message. Get each server hop in order with the delay between them, SPF, DKIM and DMARC results, Return-Path and From alignment, Message-ID, List-Unsubscribe and why it might land in spam.Is Gmail down?
Is Gmail down right now, according to Google's status dashboard?
Open Gmail incidents from Google's own Workspace Status Dashboard, read on our server at most every 5 minutes, the last 5 resolved ones, and what to do while Gmail is down or your emails are not sending.
Questions
The usual causes are a missing or failing SPF, DKIM or DMARC record, a From domain that does not align with them, a listed IP or domain, bounces from unverified addresses and too much volume from a new inbox. Each tool here checks one of those.
No. They read public DNS records, headers you paste or a status feed. The email verifier asks the mail server whether a mailbox exists and stops before sending anything.
Yes, with no account and no card. Lead counts and previews are free; contact details unlock when you export a list.
Other tool groups
Find leadsCold email & call writingGoogle Business Profile & reviewsWebsite checksPhone & data cleanupCalculators & planningFor web designersAll free tools