I have a couple of domains on my server that use an external mailserver, and therefore I have disabled mail on these domains. This worked fine before, but after I activated reject (using PLESK 7.5.1) on "mail to nonexistent users", the domains again try to accept mails for the domain and give me an errormessage instead of forwarding the mails to the external mailserver. If I switch back to bounce they behave correctly. This must be a bug? If mail is disabled for the domain, they should forward the mail to the external mailserver, not bounce/reject/accept or anything...?