Hi Brian, thanks for you answer. Here is my new configuration (postconf -n):
alias_maps = hash:/etc/aliases always_add_missing_headers = yes biff = no config_directory = /etc/postfix disable_vrfy_command = yes home_mailbox = Maildir/ mailbox_size_limit = 0 milter_default_action = accept milter_protocol = 2 mydestination = mysubdomain.mydomain.com, mydomain.com, localhost.mydomain.com, localhost mydomain = mysubdomain.mydomain.com mynetworks = 127.0.0.1/32 [::1]/128 myorigin = mysubdomain.mydomain.com non_smtpd_milters = inet:localhost:8891 smtpd_milters = inet:localhost:8891 smtpd_recipient_restrictions = permit_mynetworks, reject_unauth_destination, reject_unknown_sender_domain, reject_unknown_client_hostname, reject_rbl_client zen.spamhaus.org, reject_rbl_client bl.spamcop.net, mysubdomain.ck_policy_service inet:127.0.0.1:10023, permit virtual_alias_maps = hash:/etc/postfix/my-valiases --Mark
