mail forward for use accounts not working

hi,

when i create a mail forward for a user of a virtual domain, the mail doesn't get forwarded, but locally delivered.

i have no error messages in /var/log/mail.err or /var/log/procmail.log, so i'm a bit stuck here.

the only unusual about the server is, that i have installed mail relaying for one (other) domain according to this instructions: http://www.virtualmin.com/documentation/id,mail_relaying_with_virtualmin/

but, as stated, the mail relaying is not for the domain with the mail forwarding problem but for an other domain hosted on the same virtualmin server.

any ideas?

PAT