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Provide DKIM signing to the SMTP server/client on IBM i
DomainKeys Identified Mail, or DKIM, is an authentication protocol that links a domain name to a message. The protocol allows you to sign your email with your domain name. The purpose of the DKIM protocol is not only to prove that the domain name has not been falsely used by others, but also that the signed message has not been altered during transmission. DomainKeys Identified Mail has become a global standard in email security and is, together with its sister SPF, an absolutely necessary tool for anyone serious about mailing, especially anyone sending emails to public providers like gmail. It should be added to the IBM i SMTP server but also on the client to validate the emails.When a receiving SMTP mail server detects a signature header, it looks up the public part of the key by asking the domain name system (DNS) for the TXT record. One of the beauties of public key cryptography is that the keys are like brothers: they share DNA. Using the public key, anyone can tell whether the email was sent by the owner of the domain or not. If this validation check fails or if the message header – and therefore the digital signature – does not exist, many different email service providers (including major ones like Gmail and Outlook) raise an alarm and may, depending on the volume of email sent, decide to mark this email as spam or even to block the sender IP address.
The main reason you should use DKIM verification is pretty simple: along with SPF and DMARC, these are the main email authentication methods for verifying the identity of senders.
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