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Free tools for cold email & deliverability

Checkers, generators, calculators and analyzers to keep your sending healthy and your messages in the inbox. Every tool is free — no account needed.

AUTHENTICATION

SPF Record Checker

Validate your SPF record so your mail is authenticated and spoof-proof.

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AUTHENTICATION

SPF Record Generator

Build a valid SPF record by picking your email providers and senders.

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AUTHENTICATION

DKIM Record Checker

Confirm your emails are cryptographically signed for better deliverability.

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AUTHENTICATION

DMARC Record Checker

Verify your DMARC policy to protect your domain from spoofing.

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AUTHENTICATION

DMARC Record Generator

Generate a DMARC record with a guided policy, alignment and reporting wizard.

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TESTING

Email Spam Checker

Score your content and subject line to predict inbox vs. spam placement.

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TESTING

Spam Word Checker

Scan your copy for the exact spam-trigger words that hurt deliverability.

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TESTING

Email Template Tester

Test HTML templates for rendering issues and spam triggers across clients.

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TESTING

SMTP Tester

Test your SMTP server connection and sending credentials live.

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TESTING

IMAP Tester

Test your IMAP connection for reply tracking and inbox management.

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MONITORING

Email Blacklist Checker

Check your domain or IP against 100+ major email blacklists in seconds.

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MONITORING

Technology Lookup

See the tech stack behind any domain for technographic lead targeting.

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VERIFICATION

Email Checker & Verifier

Verify any email address for validity, catch-all and disposable domains.

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OPTIMIZATION

Subject Line Analyzer

Analyze subject lines for spam triggers, length and open-rate impact.

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OPTIMIZATION

Subject Line Tester

Score open-rate potential, spam risk and mobile preview for any subject line.

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OPTIMIZATION

Subject Line Generator

Generate attention-grabbing subject lines that lift open rates.

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CONTENT

Grammar Checker

Catch spelling, grammar and punctuation slips before you hit send.

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CONTENT

Email Signature Generator

Generate a professional HTML signature with photo, links and branding.

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CALCULATORS

Open Rate Calculator

Calculate open rate and benchmark it against industry standards.

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CALCULATORS

CTR Calculator

Calculate click-through rate and compare with benchmarks.

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CALCULATORS

Bounce Rate Calculator

Calculate bounce rate to gauge list quality and deliverability risk.

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CALCULATORS

Spam Complaint Rate Calculator

Monitor complaint rate against ISP thresholds to protect reputation.

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CALCULATORS

Email Verification Calculator

Score your list quality from verification results and see the impact.

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CALCULATORS

Mailbox Calculator

Work out how many mailboxes you need for your daily volume.

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CALCULATORS

Sending Capacity Calculator

Calculate daily sending capacity by mailbox count and provider.

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CALCULATORS

Email Delay Optimizer

Get optimal sender and campaign delays to maximize deliverability.

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CALCULATORS

Campaign Duration Calculator

Estimate how long a cold email campaign will take with your setup.

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GUIDES

Email Deliverability Guide

Best practices for authentication, warmup and inbox placement.

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GUIDES

Cold Outreach Laws

The 11 proven laws of cold email that lift response rates.

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Beyond the free tools

The whole outreach engine, free for 7 days.

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