Custom Domain Email Setup Checker

Custom Domain Email Setup Checker verifies the core DNS records your domain needs for reliable email delivery — MX, SPF, DKIM, and DMARC — in one lookup. Enter your domain to see whether mail is routed correctly, whether your sending authentication is in place, and which provider (Google Workspace, Microsoft 365, Zoho Mail, or another host) your MX records point to.

Misconfigured or missing DNS records are one of the most common reasons custom domain email breaks silently — messages bounce, land in spam, or never send at all. This tool surfaces the gaps quickly so you can fix them before they cost you deliverability.

• MX record lookup: See every mail exchange record, its priority, and the detected provider.
• SPF validation: Confirms your SPF record exists and flags the invalid case of multiple SPF records.
• DMARC lookup: Reads your policy (none, quarantine, or reject) at a glance.
• Common DKIM selector scan: Checks widely used selector names from major email providers.
• Provider setup guides: Reference MX and SPF values for Google Workspace, Microsoft 365, and Zoho Mail.

1. Enter your domain name (without http:// or www) and run the check.
2. Review the MX section to confirm mail is routed to the provider you expect.
3. Check SPF and DMARC for missing records or the multiple-SPF-record error.
4. Review the DKIM scan — if nothing is found, check your provider dashboard for your exact selector name.
5. Compare against the Provider Setup Guides tab if any record looks wrong.

Example 1: A domain migrating to Google Workspace shows a single MX record at smtp.google.com priority 1 — the modern recommended setup — alongside a valid SPF record including _spf.google.com.

Example 2: A domain shows a DMARC record with p=none, indicating authentication is being monitored via reports but not yet enforced, a common and reasonable first step before moving to quarantine or reject.

• Catch delivery-breaking gaps early: Spot missing MX, SPF, or DMARC records before they cause bounced or lost mail.
• Faster migrations: Confirm DNS changes have propagated correctly after switching providers.
• Better deliverability: Verified SPF, DKIM, and DMARC reduce the chance of landing in spam.
• No guessing on provider setup: Built-in reference values for major email providers.
• 100% free and private: No sign-up, no data stored, lookups run directly from your browser.