Deliverability tools, free to use.
The same checks we run in a client audit - built as free tools so you can catch issues before they cost you inbox placement.
Spam Word Checker
Paste a subject line or email body and catch phrases that trip spam filters, with safer alternatives one click away.
Domain Health Check
Full diagnostic for one domain, or bulk-audit your whole sending list at once with a send/fix/burned verdict per domain.
SPF Record Generator
Check off the services that send your email, get a valid SPF record with the real DNS-lookup cost of each one.
DMARC Record Generator
Generate a DMARC policy record matched to how strict you want enforcement to be - updated for the 2026 spec.
Email Placement Test
Send to a real seed list and see exactly where it landed - Inbox, a Gmail tab, or Spam - checked live over IMAP.
Email Blacklist Checker
Check a domain or sending IP against Spamhaus, Barracuda, SURBL and more - with the real removal path for every listing.
Email Header Analyzer
Paste raw headers for a plain-English read of SPF, DKIM, DMARC, alignment and where delivery was delayed. Runs in your browser.
SPF Record Checker
Read any domain's SPF record the way a receiver does - every include followed, the real DNS lookup count against the limit of 10, and what breaks it.
DMARC Record Checker
Policy, subdomain policy, reporting and alignment for any domain - and what to change on the road from p=none to p=reject.
DKIM Record Checker
Look up a DKIM key by selector or scan the 34 common ones - key size, testing mode and revoked keys.
MX Lookup
A domain's mail servers in priority order, the IPs they resolve to, the provider behind them and the mistakes that stop mail arriving.
Email Spam Test
Send a real email to a one-time address and get a spam score out of 10 - authentication, blacklists, copy, headers and Gmail placement, each with its fix.
Domain Availability Checker
Type a name, pick your extensions and see the name plus get, try, meet, team, hq, group and more on each, in one grid - live from the registries over RDAP.
Domain Age Checker
How old is a domain? Registration date, expiry and registrar from the registry - and what that age means for cold email. Bulk mode included.
SMTP Error & Bounce Code Decoder
Paste a bounce or an error like 550 5.7.1 and get what it means, whether it's permanent, and what to fix - including Gmail, Outlook and Yahoo codes.
Email Verifier
Score every address in a list from 0 to 100: mail servers, disposable and role addresses, probable typos flagged, domain age, blocklists and mailbox confirmation. Upload a CSV, download a clean list.
Gmail & Yahoo Sender Requirements
Does your domain meet the Gmail, Yahoo and Outlook.com bulk sender rules? SPF, DKIM and DMARC checked from your DNS, plus what you still have to verify.
DNS Propagation Checker
Changed an SPF, DKIM, DMARC or MX record? See on 12 public resolvers at once whether the new value is live, and who still returns the old one.
List-Unsubscribe & One-Click Checker
Paste an email's headers and check List-Unsubscribe and List-Unsubscribe-Post against RFC 8058 - the one-click unsubscribe Gmail and Yahoo require.
SPF Flattening Tool
Over the 10 DNS lookup limit? Choose which includes to flatten into IP ranges and get a ready-to-publish record, split automatically if it's too long.
Warm-Up & Mailbox Calculator
Enter your daily volume and domain age to get the mailboxes and domains you need, plus a week-by-week warm-up ramp.