MX Records & Email Check

MX, SPF, DMARC, DKIM Checker Online

The 101IP tool instantly checks the email DNS records of any domain — MX servers, SPF, DMARC and DKIM keys. Essential for diagnosing email deliverability issues.

What the tool checks

• MX — mail exchange servers and their priority;
• SPF — list of IPs allowed to send email on behalf of the domain;
• DMARC — policy for emails that fail SPF or DKIM validation;
• DKIM — presence of public keys for email signing.

Frequently Asked Questions

• Why do I need DKIM and DMARC checks if I already have SPF configured?

  SPF only validates the sending IP address, but it does not protect against spoofing of the visible "From" header. DKIM adds a cryptographic signature to each email, confirming its integrity in transit. DMARC ties both together and tells receiving servers what to do with messages that fail SPF or DKIM — reject, quarantine, or allow. Together, all three technologies provide comprehensive anti-phishing protection and improve deliverability.

• What should I do if the tool reports "SPF error: too many DNS lookups"?

  This means your SPF record contains more than 10 include mechanisms (the RFC 7208 limit). Try consolidating duplicate services or remove redundant entries. If you rely on multiple third-party sending services, consult their documentation for SPF flattening options or use our SPF generator to build an optimized record.

• I changed my MX records an hour ago, but the check still shows old data. Why?

  DNS changes do not propagate instantly — they can take anywhere from a few minutes to 48 hours, depending on the TTL of the record. Try using the DNS propagation checker to see global distribution, or simply run the test again in a few hours. Our tool queries the current cached data from authoritative name servers.