How to enable DKIM signing for outgoing emails of particular domain in Plesk?

Daniel Yordanov

Updated January 13, 2026 19:07

Plesk for Windows kb: how-to Plesk for Linux ABT: Group B Ideal

Applicable to:

Plesk for Linux
Plesk for Windows

Question

How to enable DKIM spam protection for outgoing emails of particular domain in Plesk?

Answer

Note: If primary DNS zone of the domain is with an external DNS provider, contact them in order to add the correct DKIM record there manually. Refer to this instruction in order to acquire the correct DKIM public key that should be placed there.

1. Enable DKIM support server-wide

2. Enable DKIM protection for particular domain:

via the Plesk GUI

Log into Plesk
Go to Domains > example.com > Mail > Mail Settings, check the box for Use DKIM spam protection system to sign outgoing email messages

Note: Enabling this feature also enables ARC Support for this domain automatically
Press Apply

via Plesk commands

For Linux:
1. Connect to Plesk server via SSH
2. Run the command:
  
  # /usr/local/psa/bin/domain_pref --update example.com -sign_outgoing_mail true
For Windows:
1. Connect to Plesk server via RDP
2. Run the command:
  
  C:\> "%plesk_cli%\domain_pref.exe" --update example.com -sign_outgoing_mail true

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