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Check the domain DKIM key by selector — the digital signature of your email.
A DKIM signature proves an email was really sent from your domain and not altered in transit. The public key lives in DNS at selector._domainkey.domain. Enter the domain and selector (e.g. default, google, s1) — and the service shows whether the key is published and its contents.
Where to get the selector? The mail service issues it during setup: in Google Workspace it is usually google, at mail hostings — default or mail. You can also see the selector in the headers of any sent email in the DKIM-Signature field (s= parameter). If there is no key, mail is unsigned and lands in spam more often.
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