User unknown in local recipient table??

alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/lib/postfix
default_privs = nobody
default_transport = smtp
defer_transports = smtp
inet_interfaces = all
luser_relay = postmaster@$myhostname
mail_owner = postfix
mailq_path = /usr/bin/mailq
mydestination = $myhostname, $mydomain, localhost.$mydomain, localhost
mydomain = site
myhostname = SaschasTux.site
mynetworks = 192.168.0.0/24, 127.0.0.0/8
myorigin = $myhostname
newaliases_path = /usr/bin/newaliases
notify_classes = resource, software, bounce, 2bounce, delay, policy
queue_directory = /var/spool/postfix
readme_directory = no
relay_domains = $mydestination, $mydomain
sender_canonical_maps = hash:/etc/postfix/sender_canonical
sendmail_path = /usr/sbin/sendmail
setgid_group = maildrop
smtpd_banner = $myhostname ESMTP

# REJECTING MAIL FOR UNKNOWN LOCAL USERS
#
# The local_recipient_maps parameter specifies optional lookup tables
# with all names or addresses of users that are local with respect
# to $mydestination and $inet_interfaces.
#
# If this parameter is defined, then the SMTP server will reject
# mail for unknown local users. This parameter is defined by default.
#
# To turn off local recipient checking in the SMTP server, specify
# local_recipient_maps = (i.e. empty).
#
# The default setting assumes that you use the default Postfix local
# delivery agent for local delivery. You need to update the
# local_recipient_maps setting if:
#
# - You define $mydestination domain recipients in files other than
#   /etc/passwd, /etc/aliases, or the $virtual_alias_maps files.
#   For example, you define $mydestination domain recipients in
#   the $virtual_mailbox_maps files.
#
# - You redefine the local delivery agent in master.cf.
#
# - You redefine the "local_transport" setting in main.cf.
#
# - You use the "luser_relay", "mailbox_transport", or "fallback_transport"
#   feature of the Postfix local delivery agent (see sample-local.cf).
#
# Details are described in the LOCAL_RECIPIENT_README file.