Multiple domains in a subscription without webhosting

[MatejM]

I want to have an email only subscription, but it seems that plesk doesn't allow to add additional domains if the primary domain doesn't have webhosting enabled. Is this a bug?

Also is there any option for an email address to have an alias with a different domain (example: [email protected] with an email alias [email protected]) if both of these domains are under the same subscription?