Something

alias_database = hash:/etc/mail/aliases
alias_maps = hash:/etc/mail/aliases
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/lib/postfix
debug_peer_level = 2
default_destination_concurrency_limit = 2
home_mailbox = Maildir/
html_directory = no
local_destination_concurrency_limit = 2
mail_owner = postfix
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
mydestination = $myhostname, $mydomain, localhost.$mydomain, localhost, ns3.$mydomain
mydomain = viaperu.com
myhostname = ns2.viaperu.com
mynetworks = 127.0.0.1/32 
myorigin = $mydomain
newaliases_path = /usr/bin/newaliases
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix-2.1.5-r2/readme
sample_directory = /etc/postfix
sendmail_path = /usr/sbin/sendmail
setgid_group = postdrop
smtpd_recipient_restrictions = permit_mynetworks,        check_client_access hash:/etc/postfix/pop-before-smtp,                    reject_unauth_destination,    permit
smtpd_sender_restrictions = permit_mynetworks,        check_client_access hash:/etc/postfix/pop-before-smtp,        reject
unknown_local_recipient_reject_code = 550