Free MX Record Lookup & Mail Server Inspector
Check Mail Exchange (MX) records of any domain. Inspect mail server hostnames, priorities, Google Workspace, and Microsoft 365 routing instantly.
Why Cold Outbound Teams Use Our Free MX Lookup
Mail exchange priority hierarchy
Provider auto-detection (Google, M365, Zoho)
TTL and latency verification
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 MX Lookup
What does an MX record do?
MX (Mail Exchange) records tell sending mail servers where to deliver inbound emails for your domain. If your MX records are broken, you cannot receive replies from prospects.
Can I send cold emails without MX records?
No. Modern spam filters (SpamAssassin, Google, Outlook) automatically penalize emails sent from domains without valid MX records, assuming they are throwaway spam addresses.
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