Free Domain DNS & Cold Email Infrastructure Checker
Audit your domain DNS health in 5 seconds. Checks MX, SPF, DMARC, DKIM, and A records to ensure 99%+ deliverability for US & UK cold email campaigns.
Why Cold Outbound Teams Use Our Free DNS Checker
A, MX, SPF, DMARC validation
Single-click deliverability score
Instant DNS propagation check
Email Deliverability Standards (US & UK Outbound Guidelines)
In February 2024, Google Workspace and Yahoo introduced strict anti-spam enforcement rules that mandate proper SPF, DKIM, and DMARC authentication for all outbound mailboxes. If your DNS records have syntax errors or exceed the 10-lookup threshold, incoming mail servers will silently route your cold outreach into the Spam folder or reject connections entirely.
Requires valid physical postal address in signatures, accurate From header identification, and clear opt-out mechanics.
Permits B2B outreach under legitimate interest when targeted to relevant corporate decision-makers with authenticated sender identity.
Frequently Asked Questions About DNS Checker
Why is DNS verification critical before sending cold emails?
Google Workspace and Yahoo enforce strict email authentication rules. If your domain lacks aligned SPF, DKIM, and DMARC records, incoming mail servers will immediately flag your outreach as spam or drop it completely.
What is a passing DNS score for cold outreach?
You need 100% compliance across MX, SPF (with hard or soft fail), DKIM (2048-bit key), and DMARC (at least p=none, ideally p=quarantine).
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Get fully authenticated, pre-warmed business inboxes on your own domains with dedicated US & UK IPs for just $4.00/mailbox/month.