Free Email Tools — Deliverability, Cold Email, Authentication | Warmupinbox
Free Email Tools
23 free tools built by deliverability nerds for cold outbound teams. Test inbox placement, generate DNS records, write better email copy, and quantify the impact — no signup, no upsell.
Flagship tool Placement Test
Send one test email. We grade placement across Gmail, Outlook, Yahoo, and iCloud in 60 seconds.
Run a placement test
Tools
- Placement Test Test inbox placement across Gmail, Outlook, Yahoo, and iCloud.
- Email Health Checker Audit SPF, DKIM, DMARC, MX, and blacklist status in one go.
- Blacklist Checker Check if your domain or IP is on any major email blacklist.
- SMTP Test Tool Test SMTP server connectivity, auth, and TLS.
- Email Validator Verify syntax, MX, and deliverability of any email address.
- Deliverability Test Run a full test: inbox placement, SPF, DKIM, DMARC, and content checks.
- Deliverability Audit A guided, step-by-step health check of your DNS, blacklists, and sender reputation.
- Email Reputation Checker Check if an email is valid, disposable, or spoofable, with a trust score.
- DMARC Generator Generate a DMARC record for your domain in seconds.
- SPF Generator Build a valid SPF record for all your sending sources.
- AI Email Writer Generate personalized cold email copy with AI.
- Subject Line Generator Generate ten subject line variants in seconds.
- Subject Line Tester Score any subject line for opens and spam risk.
- Spam Words Checker Scan your subject line or email body for spam trigger words.
- Email Copy Shortener Tighten your cold email without losing the point.
- Email Signature Generator Generate a clean, professional email signature.
- Email Signoff Generator Generate the right closing line for any email tone.
- Email Finder Find any professional’s email by name and domain.
- Universal Email Generator Generate every common email format from a name and domain.
- Gmail Name Generator Generate clean Gmail addresses for new sending inboxes.
- Open Rate Calculator Calculate and benchmark your campaign rates.
- Inbox Calculator Estimate how many sending inboxes your volume needs.
- Warmup Inbox ROI Calculator See your projected ROI from email warmup before you commit.
Stop guessing. Start landing in the inbox.
Warmupinbox runs the placement testing, sender warmup, and reputation monitoring behind the scenes — so you can focus on the email, not the deliverability stack.