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→DKIM
** "o=~"
** "o=-"
* _adsp._domainkey.example.com IN TXT "dkim=unknown": ** "dkim=unknown": which is the same as not defining any record, says the domain might sign some, most, or all email,** "dkim=all": all mail from the domain is signed with an Author Domain Signature** "dkim=discardable": all mail from the domain is signed with an Author Domain Signature; furthermore, if such signature is missing or invalid, the domain owners want the receiving server to drop the message; that is, silently throw it away
A selector TXT rekordja a típust is tárolja, ezért mikor a DKIM szerver lekérdezi a DNS -töl az aláírást, azt is megtudja, hogy mit tegyen hogy ha a selctor megléte ellenére nincs egy mail aláírva.