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How to configure DKIM policy in Plesk?
After enabling DKIM for a domain, two DNS records are added at Domains > example.com > DNS Settings. The DNS TXT record "_domainkey.<example.com>" contains a DKIM policy which may be adjusted.
For example, the default policy "0=-" means that all emails from this domain will be sighed with the DKIM signature.
In order to configure DKIM policy, edit this DNS TXT record.
For more information about configuring DKIM settings, refer to DKIM.org.