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Free tools for better cold email

A growing kit of deliverability checkers, record generators, calculators and copy tools, built by the MailOptimal team to help you reach more inboxes and book more meetings. Every tool runs free, right in your browser.

11Free tools

$0No cost, ever

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Deliverability & Authentication5 tools

Diagnose the DNS records that decide whether your cold email lands in the inbox or in spam.

Flagship Domain Health Checker Score your SPF, DKIM, DMARC and MX setup in one go, with an A–F grade. Check my domain SPF Record Checker Look up and validate the SPF record that authorizes who can send as you. Check SPF record DMARC Record Checker Check whether your domain publishes a DMARC policy against spoofing. Check DMARC record DKIM Record Checker Validate your DKIM key so your mail can be cryptographically signed. Check DKIM record MX & DNS Record Lookup Look up MX, TXT, A, NS and CNAME records for any domain. Look up records

Record Generators2 tools

Build correct SPF and DMARC records from your sending setup, copy-ready, no guesswork.

SPF Record Generator Assemble a valid SPF record from the providers you send through. Generate SPF record DMARC Record Generator Build a DMARC record plus a safe none → quarantine → reject rollout. Generate DMARC record

Calculators2 tools

Plan your infrastructure and project your pipeline before you spend a dollar.

Cold Email Setup Calculator Find out exactly how many mailboxes and domains your volume needs. Calculate my setup Cold Email ROI Calculator Project meetings, customers and revenue from a planned send volume. Calculate my ROI

Content & Copy2 tools

Tighten your messaging, beat spam filters and polish your sending signature.

Email Spam-Word Checker Score your cold email copy for spam triggers before you hit send. Scan my email Email Signature Generator Build a clean, copy-ready HTML email signature in seconds. Generate signature

Past the free tools

When a checker is not enough

The free tools tell you what is wrong. These three fix it, and two of them are new.

InfraOptimal NEW

Stop writing DNS records by hand. Mailboxes on a dedicated IP with SPF, DKIM, DMARC and MX set for you, from $1.00 a month.

Explore InfraOptimal

Phone Finder NEW

Verified mobiles and direct dials on any B2B contact, 10 credits a number and nothing when we miss.

Explore Phone Finder

Lead Finder

700M+ contacts with 25+ filters. Credit plans now start at $29 a month for 2,000 credits, and they roll over.

Explore Lead Finder

InfraOptimal

Deliverability starts with the IP

Warmup can only do so much on a shared pool. InfraOptimal mailboxes send from IPs reserved for your workspace, checked against the major blocklists daily, with SPF, DKIM and DMARC written for you. From $1.00 a mailbox.

Explore InfraOptimal Compare with Google and Microsoft

100 mailboxes a month	Cost
InfraOptimal, dedicated IP	$100 / mo
Google Workspace, shared IP	$400 / mo
Microsoft 365, shared IP	$400 / mo

Dedicated IPs only · 10 mailbox minimum · SMTP and IMAP included

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MailOptimal bundles all of these, plus sending, warmup and a verified lead database. Free for 14 days.

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