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.
Deliverability Testing
Diagnose whether your emails reach the inbox.
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.
Email Authentication
Configure SPF, DKIM, and DMARC on your sending domain.
Email Writing & Optimization
Write and refine cold email copy that gets replies.
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.
Find & Generate Addresses
Look up or create email addresses for outreach and testing.
Email Calculators
Quantify your performance and the impact of warmup.
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.
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