Why are wildcards not allowed on this Server-wide black & whitelist?

[Sheeko]

Why are wildcards not allowed on the Server-wide black- & whitelist? If they were, it would be so much easier to ban spammers from the server with spammer@*.eu etc., rather than having to chase and put in domains which they keep changing by the minute.

 

[IgorG]

You can define only IPs or subnets on Server wide level. And you can use * on mailbox level for black & whitelists.
You can submit corresponding feature request here http://plesk.uservoice.com