XXXX = domainname

#postconf -n:
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
append_dot_mydomain = no
biff = no
broken_sasl_auth_clients = yes
config_directory = /etc/postfix
inet_protocols = ipv4
message_size_limit = 50000000
mydestination = $myhostname  localhost
myhostname = XXXX.org
mynetworks = 127.0.0.0/8
myorigin = /etc/mailname
smtp_sasl_auth_enable = no
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_banner = XXXX ESMTP Server
smtpd_enforce_tls = no
smtpd_helo_required = yes
smtpd_recipient_restrictions = reject_non_fqdn_sender,        reject_non_fqdn_recipient,        reject_unknown_sender_domain,        reject_unknown_recipient_domain,        permit_sasl_authenticated,        permit_mynetworks,        reject_unverified_recipient,        reject_unauth_destination,        permit
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = $myhostname
smtpd_sasl_security_options = noanonymous
smtpd_tls_auth_only = yes
smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtpd_tls_session_cache_timeout = 3600s
smtpd_use_tls = yes
strict_rfc821_envelopes = yes
virtual_alias_domains =
virtual_alias_maps = mysql:/etc/postfix/mysql-virtual_alias_maps.cf
virtual_gid_maps = static:2000
virtual_mailbox_base = /var/kunden/mail/
virtual_mailbox_domains = mysql:/etc/postfix/mysql-virtual_mailbox_domains.cf
virtual_mailbox_maps = mysql:/etc/postfix/mysql-virtual_mailbox_maps.cf
virtual_uid_maps = static:2000


#cat /etc/aliases
# See man 5 aliases for format
root: username@XXXX.org
postmaster: root
logcheck: root

#When used  echo Message | mail -s "Subject" root , in syslog

Sep 27 14:09:52 XXXX postfix/pickup[14780]: 025162CA7F0C: uid=0 from=<root>
Sep 27 14:09:52 XXXX postfix/cleanup[752]: 025162CA7F0C: message-id=<20100927120952.025162CA7F0C@XXXX.org>
Sep 27 14:09:52 XXXX postfix/qmgr[14782]: 025162CA7F0C: from=<root@XXXX.org>, size=280, nrcpt=1 (queue active)
Sep 27 14:09:52 XXXX postfix/trivial-rewrite[783]: warning: do not list domain XXXX.org in BOTH mydestination and virtual_mailbox_domains
Sep 27 14:09:52 XXXX postfix/local[795]: 025162CA7F0C: to=<username@XXXX.org>, orig_to=<root>, relay=local, delay=0.06, delays=0.04/0.01/0/0.01, dsn=5.1.1, status=bounced (unknown user: "username")
Sep 27 14:09:52 XXXX postfix/cleanup[752]: 0D9762CA8BA1: message-id=<20100927120952.0D9762CA8BA1@XXXX.org>
Sep 27 14:09:52 XXXX postfix/bounce[796]: 025162CA7F0C: sender non-delivery notification: 0D9762CA8BA1
Sep 27 14:09:52 XXXX postfix/qmgr[14782]: 0D9762CA8BA1: from=<>, size=1964, nrcpt=1 (queue active)
Sep 27 14:09:52 XXXX postfix/trivial-rewrite[783]: warning: do not list domain XXXX.org in BOTH mydestination and virtual_mailbox_domains
Sep 27 14:09:52 XXXX postfix/qmgr[14782]: 025162CA7F0C: removed
Sep 27 14:09:52 XXXX postfix/local[795]: 0D9762CA8BA1: to=<username@XXXX.org>, orig_to=<root@XXXX.org>, relay=local, delay=0.04, delays=0.03/0.01/0/0.01, dsn=5.1.1, status=bounced (unknown user: "username")
Sep 27 14:09:52 XXXX postfix/qmgr[14782]: 0D9762CA8BA1: removed

But the important thing is, i can change
root: username@XXXX.org  to whatever i want, and nothing changes after newalias and a reload of proftpd