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#### Setting Up Spam Protection Based on DomainKeys

To switch on spam protection based on DomainKeys:

1. In Parallels Plesk Panel for Linux, go to Home > Mail Server Settings (in the Server group). In Parallels Plesk Panel for Windows, go to Home > Mail Server Settings (in the Server group) > Spam Filtering tab.
2. Under the DomainKeys spam protection group, select the following options:
   - Allow signing outgoing mail. Selecting this option allows you and your customers to switch on support for DomainKeys e-mail signing on a per-domain basis through the domain administration screens of the control panel (Domains > domain name > Mail group title menu > Mail Settings > Use DomainKeys spam protection system to sign outgoing e-mail messages option). It does not automatically switch on signing of outgoing e-mail messages.
   - Verify incoming mail. Selecting this option will configure the DomainKeys system to check all e-mail messages coming to e-mail users under all domains hosted on the server.
3. Click OK.

Now your mail server will check all incoming e-mail messages to ensure that they come from the claimed senders. All messages, sent from the domains that use DomainKeys to sign e-mail, which fail verification will be discarded. All messages, sent from the domains that do not participate in the DomainKeys program and do not sign e-mail, will be accepted without verifying.

To switch on signing outgoing e-mail messages for a single domain:

1. Go to Domains > domain name > Mail group title menu > Mail Settings.
2. Select the Use DomainKeys spam protection system to sign outgoing e-mail messages check box.
3. Click OK.

To switch on signing outgoing e-mail messages for a number of domains at once:

1. Click Domains.
2. Select the check boxes to the left of the domain names you need. To select all domains in the list, select the upper left check box in the column heading.
3. Click Modify.
4. Under Preferences, select the Switch on option next to the Use DomainKeys spam protection system to sign outgoing e-mail messages field.
5. Click OK.

Now, the following will happen for the selected domains:

- Private keys are generated and placed in the server's database.
- Public keys are generated and placed in the TXT resource records created in the domains' DNS zones.
- The sender's policy advertised in the DNS TXT resource records is set to "all e-mail messages sent from this domain must be cryptographically signed; if someone receives an e-mail message claiming to originate from this domain, which is not signed, then this e-mail must be discarded."
- Outgoing e-mail messages are digitally signed: the "DomainKeys-Signature" header containing a signature based on a private key is added to the message headers.