To enable DKIM signing of outgoing mail for a domain:
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Go to Websites & Domains > your domain > the “Mail” tab > Mail Settings.
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Select the “Use DKIM spam protection system to sign outgoing email messages” checkbox and then click Apply.
If you use the Plesk DNS server, you have enabled DKIM for the domain. Plesk adds the following two records to the DNS zone of the domain (example.com stands for your domain name):
default._domainkey.example.comcontains the public part of the generated key._ domainkey.example.comcontains the DKIM policy. You can edit this policy.
If you use an external DNS server, you have one more step left. Plesk cannot add the DNS records to the external DNS server. Add them yourself using a hint from Plesk.
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Click “How to configure external DNS” to open the hint. Copy two DNS records you see there and add them to the DNS server.
Note: If you have domain aliases you use to send mail, add the DKIM DNS records for them as well. Use the same records as for the main domain but with the domain alias name.