CNAME Lookup
Trace canonical name chains, test DNS alias resolution, and verify custom subdomains configured for mail sending and open tracking.
What is a CNAME record and why is it used in email?
A Canonical Name (CNAME) record maps an alias hostname to another true domain name. In email infrastructure, CNAME records are standard for delegating DKIM key management and configuring custom click & open tracking subdomains.
SES & Multi-Provider DKIM
Services like Amazon SES generate 3 CNAME records pointing to their internal key rotators, ensuring your DKIM signing keys are automatically renewed without manual DNS updates.
Branded Tracking Domains
A CNAME pointing 'track.yourdomain.com' to Mailofly's edge network ensures all email click tracking links display your company's domain, boosting user trust and spam score.
Apex Domain Restriction
Per RFC 1034, a CNAME cannot coexist with other records (like MX or SOA). Therefore, CNAMEs are used on subdomains (e.g. mail.domain.com), not the root apex.
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