Cold Email Tools
20 free tools to plan, test, validate, and optimize your cold email infrastructure. No signup required.
Calculators
Mailbox Sizing Calculator
Calculate how many mailboxes and domains you need for your cold email volume. Compare ColdRelay pricing vs Google Workspace and Microsoft 365.
Use tool →Cold Email ROI Calculator
Estimate your cold email return on investment. Input volume, reply rate, meeting rate, close rate, and deal value to see projected revenue.
Use tool →Warmup Schedule Generator
Generate a 30-day warmup calendar for your mailboxes. See the day-by-day volume ramp and warmup vs cold email split.
Use tool →Cold Email A/B Test Planner
Plan statistically valid A/B tests for cold email. Calculate sample sizes, significance thresholds, and timelines for subject lines, opening lines, CTAs, and send times.
Use tool →Deliverability
Email Blacklist Checker
Check if your domain or IP is listed on major email blocklists (DNSBLs). Instant results across 12+ blacklists used by Gmail, Outlook, and Yahoo.
Use tool →Domain Reputation Checker
Check your domain's email authentication records — SPF, DKIM, DMARC, MX, A, and BIMI — and get a reputation score from 0 to 100.
Use tool →Inbox Placement Tester
Estimate your inbox placement rate based on an 8-point deliverability checklist. Score your cold email setup and get actionable recommendations.
Use tool →Email Header Analyzer
Paste raw email headers to inspect SPF, DKIM, and DMARC authentication results, trace the routing path, and extract key fields.
Use tool →Domain Age Checker
Check when a domain was registered and whether it's old enough for cold email. Shows registration date, registrar, nameservers, and readiness assessment.
Use tool →DNS Tools
MX Record Lookup
Look up MX records for any domain. See mail server priorities, detect the email provider, and verify email routing configuration.
Use tool →Email Deliverability Test
Check your SPF, DKIM, DMARC, and MX records. Get a deliverability score out of 100 with actionable recommendations.
Use tool →SPF Record Generator
Generate a valid SPF record for your domain. Add authorized senders, IPs, and includes with a visual builder.
Use tool →DKIM Record Generator
Generate DKIM DNS records for your domain. Set the selector, key size, and get the TXT record ready to publish.
Use tool →DMARC Record Generator
Build a DMARC policy for your domain. Choose your policy level, set reporting addresses, and generate the DNS record.
Use tool →Content
Cold Email Template Generator
Generate proven cold email templates for different industries and use cases. Personalize with your company details and start sending.
Use tool →Email Sequence Builder
Generate a complete cold email sequence — initial email plus follow-ups with optimal timing. Customized for your product, audience, and tone.
Use tool →Subject Line Generator
Generate high-converting subject lines for cold email. Test different approaches — curiosity, personalization, urgency, and more.
Use tool →Spintax Generator & Previewer
Paste your email with spintax syntax, see total unique variations, preview random outputs, and highlight spintax segments.
Use tool →Email Signature Generator
Create a clean, professional HTML email signature. Multiple styles — minimal, professional, bold — with live preview and one-click copy.
Use tool →Tools Are Great. Automation Is Better.
Stop manually checking DNS, monitoring blocklists, and managing mailboxes. ColdRelay automates your entire cold email infrastructure — from domain setup to deliverability monitoring.
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