Sometimes this delay can be as long as several days due to some temporary errors on the receiving server. The reason for that is there might be some delay between when an email leaves the originating server and when it's accepted by the receiving server. The old key should be kept for a period of 7 days, after which it can be safely removed. After this is done, the outgoing email server will use the new private key to sign all outgoing email messages. Then the public key will need to be published in the DNS, and you need to re-configure the outgoing email server to use the new private key. What is DKIM selector?Ī DKIM selector, as indicated by the name, is a string used by the outgoing server to locate the private key to sign the email message, and by the receiving server to locate the public key in the DNS to verify the integrity of the email message.Įach time a private/public key pair is generated, a tuple tuple is created. In this article we will explain various concepts related to DKIM selectors: what are they, why do we need them, and how they work in DKIM authentication.
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