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There's only S/MIME, TLS and BIMI+VMC that use actual certificates. DKIM does not and DKIM keys should be rotated once in a while, but few do.
by Avamander 4y ago
There's only S/MIME, TLS and BIMI+VMC that use actual certificates.
DKIM does not and DKIM keys should be rotated once in a while, but few do.