checkbox for domainkeys is disabled

[spot8ptr]

How do I enable domainkeys ? (seems the checkbox is disabled, I can't click it)

"Use DomainKeys spam protection system to sign outgoing e-mail messages" (disabled checkbox) "(Server policy)"

 

[sergius]

http://download1.swsoft.com/Plesk/Plesk8.6/Doc/en-US/plesk-8.6-unix-administrators-guide/56325.htm