Free Cold Email &
Deliverability Infrastructure Tools
Everything outbound sales teams and lead generation agencies need to diagnose DNS health, configure authentication, eliminate spam trigger words, and ensure 99%+ primary inbox placement.
CHECK DNS
Validate DNS records, mail servers, and authentication records
DNS Checker
Complete 5-point DNS audit for outbound cold email domains.
MX Lookup
Inspect mail server hostnames, priorities, and email providers.
SPF Checker
Validate syntax, detect multiple records, and prevent 10-lookup limit failures.
DMARC Checker
Verify Google & Yahoo compliance, policy strength, and reporting rua/ruf tags.
DKIM Checker
Test DKIM selector records, verify 2048-bit public keys, and check alignment.
GENERATE
Generate copy-paste compliant DNS, spintax, and lead assets
Spintax Generator
Generate random cold email spintax variations to evade ESP spam filters.
Email Permutator
Generate 34+ standard business email patterns from prospect name & domain.
SPF Generator
Build clean, error-free SPF TXT records for your outreach email setup.
DMARC Generator
Generate compliant _dmarc TXT records with custom policy and reporting.
DKIM Generator
Generate DKIM DNS record templates and selector configs.
BIMI Generator
Generate BIMI TXT records to show your brand logo in recipient inboxes.
Signature Builder
Create clean, spam-safe HTML email signatures that boost inbox placement.
TEST & SCORE
Analyze deliverability risk, spam triggers, subject lines, and rendering
Subject Line Tester
Audit subject line length, sentiment, and mobile preview score.
Catch-All Checker
Detect if target domains accept all incoming addresses to avoid silent bounces.
Header Analyzer
Inspect raw email headers for SPF/DKIM/DMARC pass/fail and relay hops.
Blacklist Checker
Check your domain or IP against 15+ major global anti-spam blacklists.
Spam Word Checker
Scan your cold email copy for high-risk spam trigger words and phrases.
Mobile Preview
Preview your subject line, preview snippet, and layout on mobile devices.
Accessibility Checker
Ensure your outreach emails are readable, high-contrast, and accessible.
Bounce Analyzer
Diagnose SMTP bounce errors (550, 554, 421) and get exact remediation steps.
PLAN
Calculate warmup ramp-up curves, sending hours, ROI, and A/B test statistical significance
ROI & Pipeline Calculator
Calculate projected pipeline, booked meetings, and ROI from outbound campaigns.
A/B Test Significance
Test if your cold email A/B variations have reached 95% statistical confidence.
Warm-Up Calculator
Calculate 21-day ramp curves, daily mailbox volume, and domain safety limits.
Best Time to Send
Plan optimal sending windows for US (EST, CST, PST) and UK (GMT) prospects.
Deploy 100% Pre-Warmed Inboxes with Perfect SPF, DKIM & DMARC
Skip the manual setup and waiting. Get active business mailboxes with isolated US & UK IP sockets for just $4.00/mailbox/month.