DKIM is an email authentication method. When an email is sent using DKIM, a cryptographic digital signature verifies the message's validity. This method creates a unique digital signature for an email message using a hashing algorithm and validates that signature on a mail server using DNS settings.
Please contact Clearbooks support for information on how to use DKIM to sign your emails. You can contact them at support@clearbooks.co.uk.
Lookup and validate the published DKIM DNS record using this free DKIM record lookup tool.
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