USE="apache2 mysql unicode"

#SysCP flags:
# we only need mysql auth
dev-libs/cyrus-sasl -authdaemond ssl
mail-mta/postfix ssl sasl
www-servers/apache php ssl
dev-php/php cli

[...]
APACHE2_OPTS="-D PHP5"
[...]

[...]
Include /etc/apache2/vhosts.d/99_syscp_vhosts.conf

Don't forget to change the mysql password!

ServerName                      "FTP Server"
ServerType                      standalone
DeferWelcome                    off

MultilineRFC2228                on
DefaultServer                   on
ShowSymlinks                    on
AllowOverwrite                  on

TimeoutNoTransfer               600
TimeoutStalled                  600
TimeoutIdle                     1200

DisplayLogin                    welcome.msg
DisplayFirstChdir               .message
ListOptions                     "-l"

DenyFilter                      \*.*/

Port                            21
MaxInstances                    30

# Set the user and group that the server normally runs at.
User                            nobody
Group                           nogroup

<Directory /*>
# Umask 022 is a good standard umask to prevent new files and dirs
# (second parm) from being group and world writable.
  Umask                         022  022
# Normally, we want files to be overwriteable.
  AllowOverwrite                on
</Directory>

DefaultRoot ~
RequireValidShell off

# Don't use Plaintext, theres a high risk that anyone can log in your ftp-server!
# More info: http://blog.syscp.org/archives/58-Security-warning-Possible-remote-code-injection-when-using-Debian-SargeEtch.html
# SQLAuthTypes Crypt Plaintext
SQLAuthTypes Crypt
SQLAuthenticate users* groups*
SQLConnectInfo syscp@localhost syscp <SYSCP_MYSQL_PASSWD>
SQLUserInfo ftp_users username password uid gid homedir shell
SQLGroupInfo ftp_groups groupname gid members
SQLUserWhereClause "login_enabled = 'y'"

SQLLog PASS login
SQLNamedQuery login UPDATE "last_login=now(), login_count=login_count+1 WHERE username='%u'" ftp_users

SQLLog RETR download
SQLNamedQuery download UPDATE "down_count=down_count+1, down_bytes=down_bytes+%b WHERE username='%u'" ftp_users

SQLLog STOR upload
SQLNamedQuery upload UPDATE "up_count=up_count+1, up_bytes=up_bytes+%b WHERE username='%u'" ftp_users

smtpd_banner = $myhostname ESMTP $mail_name (Gentoo/GNU)
biff = no
queue_directory = /var/spool/postfix
command_directory = /usr/sbin
daemon_directory = /usr/lib/postfix
mail_spool_directory = /var/spool/mail

append_dot_mydomain = no
myhostname = MANAGEMENT.TLD
mydomain = MANAGEMENT.TLD
mydestination = $myhostname $mydomain localhost localhost.$mydomain
mynetworks = 127.0.0.0/8
alias_maps = $alias_database
inet_interfaces = all
mail_owner = postfix

readme_directory = /usr/share/doc/postfix-2.1.5-r1/readme
alias_database = hash:/etc/mail/aliases
local_destination_concurrency_limit = 2
default_destination_concurrency_limit = 10
alias_maps = hash:/etc/mail/aliases
sendmail_path = /usr/sbin/sendmail
newaliases_path = /usr/bin/newaliases
mailq_path = /usr/bin/mailq
setgid_group = postdrop
html_directory = no
manpage_directory = /usr/share/man
sample_directory = /etc/postfix

smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination
smtpd_use_tls = yes

smtpd_tls_key_file = /etc/postfix/newreq.pem
smtpd_tls_cert_file = /etc/postfix/newcert.pem
smtpd_tls_CAfile = /etc/postfix/cacert.pem
smtpd_tls_loglevel = 3
smtpd_tls_received_header = yes
smtpd_tls_session_cache_timeout = 3600s
tls_random_source = dev:/dev/urandom

virtual_mailbox_base = /var/customers/mail/
virtual_mailbox_maps = mysql:/etc/postfix/mysql-virtual_mailbox_maps.cf
virtual_mailbox_domains = mysql:/etc/postfix/mysql-virtual_mailbox_domains.cf
virtual_alias_domains =
virtual_alias_maps = mysql:/etc/postfix/mysql-virtual_alias_maps.cf
virtual_uid_maps = static:2000
virtual_gid_maps = static:2000
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = $myhostname
smtpd_sasl_security_options = noanonymous
virtual_transport = virtual

user = syscp
password = SYSCP_MYSQL_PASSWORD
dbname = syscp
table = mail_users
select_field = maildir
where_field = email
hosts = localhost

user = syscp
password = SYSCP_MYSQL_PASSWORD
dbname = syscp
table = panel_domains
select_field = domain
where_field = domain
additional_conditions = and isemaildomain = 1
hosts = localhost

user = syscp
password = SYSCP_MYSQL_PASSWORD
dbname = syscp
table = mail_virtual
select_field = destination
where_field = email
hosts = localhost

authmodulelist="authmysql"
authmodulelistorig="authcustom authcram authuserdb authldap authmysql authpam"
daemons=5
version=""
authdaemonvar=/var/lib/courier-imap/authdaemon

AUTHDAEMOND="authdaemond.mysql"

edit the syscp_password

MYSQL_SERVER localhost
MYSQL_USERNAME syscp
MYSQL_PASSWORD syscp_password
MYSQL_PORT 3136
MYSQL_DATABASE syscp
MYSQL_USER_TABLE mail_users
MYSQL_CRYPT_PWFIELD password_enc
MYSQL_UID_FIELD uid
MYSQL_GID_FIELD gid
MYSQL_LOGIN_FIELD username
MYSQL_HOME_FIELD homedir
MYSQL_MAILDIR_FIELD maildir

from the Maildropmodule

#! /usr/bin/php4

#! /usr/bin/php

don't forget to change this line:
dbpw syscp_password

# The attributes are:
#
# mail - The full email address of the user (ie user@yourdomain.com)
#        This is the primary attribute searched upon by maildrop.
#
# maildir - The location (full path including name) of the users
#           mail directory (Maildir)
#
# homedirectory - The location (full path including name) of the
#                 users home directory.  This may be the same as the
#                 users maildir.
#
# uidnumber - The uid of the user that owns the mail files for
#             this user.  This may be a specific uid per user,
#             or a single uid for every user (full 'virtual' user
#             configuration), or a combination.
#
# gidnumber - The gid of the user that owns the mail files for
#             this user.  This may be a specific gid per user,
#             or a single gid for every user (full 'virtual' user
#             configuration), or a combination.
#
# quota     - *OPTIONAL* The quota for this user.  If blank, or
#             non-existent defaults to no quota.
# mailstatus - account status
#
# A sample LDAP entry is given at the end of this file.
#
# --- Actual configuration begins here -----------------------------

# hostname - host name of your mysql server
hostname        localhost
port            3306
socket          /var/run/mysqld/mysqld.sock
database        syscp
dbuser          syscp
dbpw            syscp_password
dbtable         mail_users

#not used now
#timeout                5

# default_uid - default uid (number only) to use incase uidnumber attribute not
# found in users mysql entry
default_uidnumber       2000

# default_gid - default gid (number only) to use incase gidnumber attribute not
# found in users ldap entry
default_gidnumber       2000

# MySQL Field definitions
#
# This section allows you to specify the actual attributes you
# use in your Mysql record
#
# The example attribute mapping shown below is also the default
# mapping used by maildrop in the case that any are missing

# UID_FIELD - MySQL attribute which contains the users name (w or w/o domain)
uid_field               email

# UIDNUMBER_FIELD - MySQL attribute which contains the system uid to deliver
# mail as
uidnumber_field         uid

# GIDNUMBER_FIELD - MySQL attribute which contains the system gid to deliver
# mail as
gidnumber_field         gid

# MAILDIR_FIELD - MySQL attribute which contains the path to the users
# custom maildir
maildir_field           maildir

# HOMEDIRECTORY_FIELD - MySQL attribute which contains the path to the users
# home directory
homedirectory_field     homedir

# QUOTA_FIELD - MySQL attribute which contains the users quota
# set standard for all maildirs or use a new mysql field
quota_field             '50000000'

# MYSQL_DEFAULT_STATUS_FIELD - MySQL attribute which could be created in the
# MySQL entry to set whether or not the user is allowed to receive email on
# this box..
#               -- looks unused for now; but must be valid column ! (2001-11-03)
mailstatus_field        postfix

# MYSQL_DEFAULT_WHERE_CLAUSE - This is optional !
# It can be set to any fixed string starting with keyword 'AND'.
# It will then be appended to the WHERE clause of our query.
where_clause            AND postfix = "Y"

# Settings:
SYSCPBASEDIR="/var/www/localhost/htdocs/syscp"
SCANSPAMSIZE="250000"   # mails, which are smaller will not be scanned
VSCANSIZE="2000000"
logfile "/var/log/maildrop.log"
MAILFILTERDIR="/var/costumers/mailfilter"




######################
# Let's start

EXTENSION="$1"
RECIPIENT="$2"
USER="$3"
HOST="$4"
SENDER="$5"


# the current users maildir is located in $DEFAULT
MAILDIR = $DEFAULT
DELIVERY = $DEFAULT     # where the mail will go at the end of the script


# Has the maildir already been created?
`test -d "$MAILDIR"`
if( $RETURNCODE == 1 )
{
        `mkdir -p $DELIVERY`
        `rmdir $DELIVERY`
        `/usr/bin/maildirmake "$MAILDIR"`
}


# Obtain settings from the mysql db
# first we have to init the vars
VSCAN=0
SPAMFILTER=0
# Run our script and get the values :)
`$SYSCPBASEDIR/scripts/modules/maildrop/getsettings.php "$LOGNAME"`
if ($RETURNCODE >= 2)
{       VSCAN=1;
        RETURNCODE= $RETURNCODE - 2;
}
if ($RETURNCODE >= 1)
{       SPAMFILTER=1;
}


exception {
        include $MAILFILTERDIR/$LOGNAME
}


#ok, let's filter

if ($VSCAN)
{       if($SIZE < $VSCANSIZE)
        {
                exception {
                        xfilter "$SYSCPBASEDIR/scripts/modules/maildrop/clamscan.sh"
                }
        }
        if ((/^X-Virus-Status:.*INFECTED/))
        {
                DELIVERY = $MAILDIR.Infected
                SPAMFILTER=0
        }
}

if ( $SPAMFILTER )
{       # Is the mail already marked as spam?
        if (/^X-Spam-Flag: YES/)
        {       DELIVERY = $MAILDIR.Spam
                SPAMFILTER=0
        }
        if ( $SIZE < $SCANSPAMSIZE )
        {       exception {
                      xfilter "spamc -u $LOGNAME"
                }
                # Spam?
                if (/^X-Spam-Flag: YES/)
                {       DELIVERY = $MAILDIR.Spam
                }
        }
}

# create needed sub-directory, if it doesn't exist
`test -d "$DELIVERY"`
if( $RETURNCODE == 1 )
{
        `mkdir -p $DELIVERY`
        `rmdir $DELIVERY`
        `/usr/bin/maildirmake "$DELIVERY"`
}

log "=========="

# finally, deliver the mail
to $DELIVERY/

[..]
START_CLAMD=yes
[..]

if you got no errors (except the quota) enable maildrop in postfix

[...]
virtual_transport = maildrop
maildrop_destination_recipient_limit = 1

should looks like this (the gentoo orginal looks littlebit different)

[...]
maildrop  unix  -       n       n       -       -       pipe
  flags=DRhu user=vmail:vmail argv=/usr/bin/maildrop -d ${recipient} ${extension} ${recipient} ${user} ${nexthop} ${sender}
[...]