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DNS lookup — inspect records for email authentication.

Query TXT, CNAME, A, and other DNS records for any hostname. Use when verifying SPF, DKIM, and tracking CNAME values from your SMTP-X dashboard.

Which DNS records matter for email?

SPF (TXT)

Lists authorized senders for your domain. Required for SMTP-X domain verification.

DKIM (TXT)

Cryptographic signature proving messages were sent by you. Usually on a selector subdomain.

Tracking CNAME

Branded click/open tracking domain — see click tracking.

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