root@mx1:/etc/postfix# cat main.cf
# See /usr/share/postfix/main.cf.dist for a commented, more complete version

myhostname = mx1.kappuccino.net
smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
biff = no

# appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h

alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
mydestination =
#$myhostname, localhost.$mydomain, localhost
relayhost =
mynetworks = 127.0.0.0/8 91.121.239.85

inet_interfaces = all
recipient_delimiter = +
#myorigin = /etc/mailname
mailbox_size_limit = 0
Maildir = Maildir/


# Virtual Mailbox Domain Settings
virtual_alias_maps = mysql:/etc/postfix/mysql_virtual_alias_maps.cf
virtual_mailbox_domains = mysql:/etc/postfix/mysql_virtual_domains_maps.cf
virtual_mailbox_maps = mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf
virtual_mailbox_limit = 51200000
virtual_minimum_uid = 5000
virtual_uid_maps = static:5000
virtual_gid_maps = static:5000
virtual_mailbox_base = /home/vmail
virtual_transport = virtual

# Additional for quota support
virtual_create_maildirsize = yes
virtual_mailbox_extended = yes
virtual_mailbox_limit_maps = mysql:/etc/postfix/mysql_virtual_mailbox_limit_maps.cf
virtual_mailbox_limit_override = yes
virtual_maildir_limit_message = Sorry, the your maildir has overdrawn your diskspace quota, please free up some of spaces of your mailbox try again.
virtual_overquota_bounce = yes

#smtpd_recipient_restrictions = reject_unauth_pipelining, permit_mynetworks, permit_sasl_authenticated, reject_non_fqdn_recipient, reject_unknown_recipient_domain reject_unauth_destination, permit
#reject_non_fqdn_recipient, reject_unknown_recipient_domain reject_unauth_destination, permit
#smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, permit

smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, check_relay_domains, permit


# modify the existing smtpd_sender_restrictions
#smtpd_sender_restrictions = permit_sasl_authenticated, reject_unauth_pipelining, permit
#, permit_mynetworks, reject_non_fqdn_sender, reject_unknown_sender_domain


#"smtpd_recipient_restrictions": specify at least one working instance of: check_relay_domains, reject_unauth_destination, reject, defer or defer_if_permit


#smtpd_sender_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unknown_sender_domain
# permit_mynetworks, permit_sasl_authenticated,
#reject_unknown_sender_domain


# then add these
smtpd_sasl_auth_enable = yes
broken_sasl_auth_clients = yes
smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain =
smtpd_sasl_authenticated_header = yes



transport_maps = hash:/etc/postfix/transport
vacation_destination_recipient_limit = 1

smtp_tls_loglevel=4