What the cold email checker does
Paste your subject line and body and this tool scores how likely your cold email is to reach the inbox. It scans for spam trigger words, checks your subject length and tone, counts links, and flags common mistakes, then adds a live check of your sending domain's SPF, DKIM and DMARC records. The content analysis runs entirely in your browser, so your email text is never uploaded.
Why deliverability matters
A brilliant cold email is worthless in the spam folder. Two things decide whether you land in the inbox: authentication (does your domain prove the mail is really from you?) and content signals (does it look like spam?). This tool checks both in seconds, unlimited and free, where most spam testers cap your free checks.
Email authentication, in plain English
- SPF lists the servers allowed to send email for your domain.
- DKIM adds a cryptographic signature so receivers can confirm the message wasn't tampered with.
- DMARC ties SPF and DKIM together, tells receivers what to do on failure, and lets you catch spoofing.
Missing or weak records are one of the most common reasons cold email gets filtered. The tool looks these up live via public DNS-over-HTTPS and tells you what to fix.
How to use it
- Paste your subject and body exactly as you'd send them.
- Add your sending domain (optional) to include the SPF/DKIM/DMARC checks.
- Read the score and the fix-it list, then tighten the flagged items and re-check.
Good to know
- Your email content never leaves your browser; only the domain name is used for public DNS lookups.
- A few spam-adjacent words are usually fine, it's the combination with weak authentication that hurts.
- Cold email should always offer an easy opt-out, both for deliverability and because many jurisdictions require it.