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Debian Wheezy Mail Server – Postfix Dovecot Sasl MySQL PostfixAdmin RoundCube SpamAssassin Clamav Greylist Nginx PHP5

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This is a tutorial on how to install an email server on Debian Wheezy 7.

We are going to install the following components:

E-mail server:

  • Postfix
  • Dovecot
  • Sasl library
  • MySQL

Milters:

  • SpamAssassin
  • Clamav
  • Greylist

Webserver:

  • Nginx
  • PHP5
  • phpMyAdmin
  • PostfixAdmin
  • RoundCube

Please replace any text in red with your info.

Here is a scheme about the internals, click on image to get a clear view:

 

mailserver_diagram1.png

1. Install Debian Wheezy 7

When installing Debian 7 itself, only select ‘SSH server’ when prompted to select software.

If Debian is ready, install the following packages:

apt-get install sudo mc vim

2. Install MySQL server and client

apt-get install mysql-server mysql-client

Enter a MySQL root password when prompted.

Check that mysqld is running:

ps aux

3. Install PHP5 and Nginx

At this point I use the Dotdeb repo to install PHP version 5.5.x

Add Dotdeb repositories to /etc/apt/sources.list file:

deb http://packages.dotdeb.org wheezy-php55 all

deb-src http://packages.dotdeb.org wheezy-php55 all

Add Dotdeb key:

wget http://www.dotdeb.org/dotdeb.gpg

sudo apt-key add dotdeb.gpg

Update apt cache:

apt-get update

Install PHP5 and Nginx:

apt-get install php5-fpm php5-imap php5-mysql php5-mcrypt php5-intl nginx openssl ssl-cert

Make sure php5-fpm and nginx are running:

service php5-fpm start

service nginx start

Create a folders to store web files:

mkdir /home/clients_ssl

mkdir /home/clients_ssl/<subdomain.domain.tld>

mkdir /home/clients_ssl/<subdomain.domain.tld>/logs

mkdir /home/clients_ssl/<subdomain.domain.tld>/tmp

mkdir /home/clients_ssl/<subdomain.domain.tld>/www

Create nginx config for this site:

vi /etc/nginx/sites-available/<subdomain.domain.tld>_ssl

Press ‘i’ and paste the following in vim, replace <yourip> and <subdomain.domain.tld> with your info:

server {

listen <yourip>:443;

server_name <subdomain.domain.tld>;

ssl on;

ssl_certificate /etc/nginx/certs/<subdomain.domain.tld>.combined.crt;

ssl_certificate_key /etc/nginx/certs/<subdomain.domain.tld>.key;

root /home/clients_ssl/<subdomain.domain.tld>/www;

index index.php index.html index.htm;

location ~ .php$ {

fastcgi_pass unix:/etc/php5/fpm/socks/ssl_<subdomain.domain.tld>.sock;

include fastcgi_params;

fastcgi_param HTTPS on;

}

location ~ /. {

deny all;

}

access_log /home/clients_ssl/<subdomain.domain.tld>/logs/access.log;

error_log /home/clients_ssl/<subdomain.domain.tld>/logs/error.log;

error_page 404 /404.html;

}

Remove the default site and put your site online:

rm /etc/nginx/sites-available/default

ln -s /etc/nginx/sites-available/<subdomain.domain.tld>_ssl /etc/nginx/sites-enabled/<subdomain.domain.tld>_ssl

Create the certs folder.

mkdir /etc/nginx/certs

Put your cerificates in there. Get a valid certificate from a certificate authority or create a self signed certificate.

You can google on how to make one. Make sure to edit your Nginx config file to match the certificate filenames.

Restart Nginx

service nginx restart

Create a php5-fpm config file:

vi /etc/php5/fpm/pool.d/ssl_<subdomain.domain.tld>.conf

Press ‘i’ and paste the following in vim, replace <subdomain.domain.tld> with your info:

[ssl_<subdomain.domain.tld>]

listen = /etc/php5/fpm/socks/ssl_<subdomain.domain.tld>.sock

user = u1001

group = g1001

listen.owner = www-data

listen.group = www-data

listen.mode = 0666

pm = dynamic

pm.max_children = 50

pm.start_servers = 1

pm.min_spare_servers = 1

pm.max_spare_servers = 5

pm.max_requests = 0

php_admin_value[open_basedir]=/

php_admin_value[session.save_path]=/home/clients_ssl/<subdomain.domain.tld>/tmp

php_admin_value[upload_tmp_dir]=/home/clients_ssl/<subdomain.domain.tld>/tmp

php_admin_value[disable_functions]=dl

Create a user for this virtualhost:

groupadd -g 1001 g1001

useradd --no-create-home -g 1001 -u 1001 u1001

Create socks folder:

mkdir /etc/php5/fpm/socks

Remove the default php pool:

rm /etc/php5/fpm/pool.d/www.conf

Add timezone info to php ini file /etc/php5/fpm/php.ini:

date.timezone = Europe/Tallinn

Restart php5-fpm

service php5-fpm restart

4. Install phpMyAdmin

cd /home/clients_ssl/<subdomain.domain.tld>/www

wget 'http://downloads.sourceforge.net/project/phpmyadmin/phpMyAdmin/4.0.8/phpMyAdmin-4.0.8-english.tar.gz?use_mirror=netcologne'

mv phpMyAdmin-4.0.8-english.tar.gz?use_mirror=netcologne pma.tar.gz

tar -zxvf pma.tar.gz

Hide pma or bots will try to hack into it:

mv phpMyAdmin-4.0.8-english pma_763773

cd pma_763773

cp config.sample.inc.php config.inc.php

Set the right owner for www and tmp folder:

cd /home/clients_ssl/<subdomain.domain.tld>

chown -R 1001.1001 www tmp

Now you should be able to access pma at: https://<subdomain.domain.tld>/pma_763773/

Now open phpMyAdmin and click on ‘SQL’ on the top menubar. Paste the following SQL queries to create a database and user, replace <password> as you see fit:

CREATE DATABASE postfix;

GRANT ALL PRIVILEGES ON postfix.* TO 'postfix_admin'@'%' IDENTIFIED BY '<dbpassword1>';

GRANT SELECT ON postfix.* TO 'postfix'@'%' IDENTIFIED BY '<dbpassword2>';

FLUSH PRIVILEGES;

5. Install PostfixAdmin

Although you can install it from a standard Debian package I am going to download it directly instead so I can put it under my custom path immediately.

cd /home/clients_ssl/<subdomain.domain.tld>/www

wget 'http://downloads.sourceforge.net/project/postfixadmin/postfixadmin/postfixadmin-2.3.6/postfixadmin-2.3.6.tar.gz?use_mirror=garr'

mv postfixadmin-2.3.6.tar.gz?use_mirror=garr pfa.tar.gz

tar -zxvf pfa.tar.gz

mv postfixadmin-2.3.6 pfa_746338

chown -R 1001.1001 pfa_746338

cd pfa_746338

sed -i 's/change-this-to-your.domain.tld/<subdomain.domain.tld>/g' config.inc.php

Now edit configuration file config.inc.php and change these values:

$CONF['configured'] = true;

$CONF['postfix_admin_url'] = 'https://<subdomain.domain.tld>/pfa_746338';

$CONF['database_type'] = 'mysqli';

$CONF['database_host'] = 'localhost';

$CONF['database_user'] = 'postfix_admin';

$CONF['database_password'] = '<dbpassword1>';

$CONF['database_name'] = 'postfix';

$CONF['domain_path'] = 'YES';

$CONF['domain_in_mailbox'] = 'NO';

$CONF['fetchmail'] = 'NO';

Go to https://<subdomain.domain.tld>/pfa_746338/setup.php

This setup script should create the nesessary tables to postfix database.

At the bottom of setup.php enter your admin password and click ‘Gererate password hash’.

Edit config.inc.php and add the hash:

$CONF['setup_password'] = '<hash>';

Now enter superadmin account info. You can use this to access PostfixAdmin and configure domains, e-mail accounts, aliases etc.

Try to log in with the admin account here: https://<subdomain.domain.tld>/pfa_746338

6. Install Postfix and Sasl library

apt-get install postfix postfix-mysql libsasl2-modules libsasl2-modules-sql

When prompted, choose ‘Internet Site’.

Use yor domain name as ‘System mail name': <subdomain.domain.tld>

For example use ‘mail.yourdomain.tld’. Do not use ‘yourdomain.tld’ here if it is going to be one of your virtual mailbox domains.

Create virtual mail user and group:

groupadd -g 3000 vmail

useradd -d /home/vmail -m -u 3000 -g 3000 vmail

Edit /etc/postfix/main.cf:

mydestination = <subdomain.domain.tld>, localhost

and add the following lines:

virtual_uid_maps = static:3000

virtual_gid_maps = static:3000

virtual_mailbox_base = /home/vmail

virtual_mailbox_domains = mysql:/etc/postfix/mysql_virtual_mailbox_domains.cf

virtual_mailbox_maps = mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf

virtual_alias_maps = mysql:/etc/postfix/mysql_virtual_alias_maps.cf

relay_domains = mysql:/etc/postfix/mysql_relay_domains.cf

virtual_transport = lmtp:unix:private/dovecot-lmtp

smtpd_recipient_restrictions =

permit_mynetworks,

permit_sasl_authenticated,

reject_non_fqdn_hostname,

reject_non_fqdn_sender,

reject_non_fqdn_recipient,

reject_unauth_destination,

reject_unauth_pipelining,

reject_invalid_hostname

smtpd_sasl_auth_enable = yes

smtpd_sasl_security_options = noanonymous

smtpd_sasl_type = dovecot

smtpd_sasl_path = private/auth

milter_default_action = accept

Create the following files:

/etc/postfix/mysql_virtual_mailbox_domains.cf

hosts = 127.0.0.1

user = postfix

password = <dbpassword2>

dbname = postfix

query = SELECT domain FROM domain WHERE domain='%s' and backupmx = 0 and active = 1

/etc/postfix/mysql_virtual_mailbox_maps.cf

hosts = 127.0.0.1

user = postfix

password = <dbpassword2>

dbname = postfix

query = SELECT maildir FROM mailbox WHERE username='%s' AND active = 1

/etc/postfix/mysql_virtual_alias_maps.cf

hosts = 127.0.0.1

user = postfix

password = <dbpassword2>

dbname = postfix

query = SELECT goto FROM alias WHERE address='%s' AND active = 1

/etc/postfix/mysql_relay_domains.cf

hosts = 127.0.0.1

user = postfix

password = <dbpassword2>

dbname = postfix

query = SELECT domain FROM domain WHERE domain='%s' and backupmx = 1

/etc/postfix/sasl/smtpd.conf

pwcheck_method: auxprop

mech_list: plain login

auxprop_plugin: sql

sql_engine: mysql

sql_hostnames: 127.0.0.1

sql_user: postfix

sql_passwd: <dbpassword2>

sql_database: postfix

sql_select: SELECT password FROM mailbox WHERE username = '%u@%r' AND active = 1

Add postfix user to sasl group:

adduser postfix sasl

Enable secure smtp ports, edit /etc/postfix/master.cf and uncomment:

submission inet n - - - - smtpd

-o syslog_name=postfix/submission

-o smtpd_tls_security_level=encrypt

-o smtpd_sasl_auth_enable=yes

-o smtpd_client_restrictions=permit_sasl_authenticated,reject

-o milter_macro_daemon_name=ORIGINATING

smtps inet n - - - - smtpd

-o syslog_name=postfix/smtps

-o smtpd_tls_wrappermode=yes

-o smtpd_sasl_auth_enable=yes

-o smtpd_client_restrictions=permit_sasl_authenticated,reject

-o milter_macro_daemon_name=ORIGINATING

7. Install Dovecot

apt-get install dovecot-imapd dovecot-pop3d dovecot-mysql dovecot-lmtpd

Create file /etc/dovecot/dovecot-mysql.conf.ext:

driver = mysql

connect = host=127.0.0.1 dbname=postfix user=postfix password=<dbpassword2>

default_pass_scheme = MD5-CRYPT

user_query = SELECT '/home/vmail/%d/%n' as home, 3000 AS uid, 3000 AS gid FROM mailbox WHERE username = '%u'

password_query = SELECT password FROM mailbox WHERE username = '%u'

Edit /etc/dovecot/conf.d/10-auth.conf

disable_plaintext_auth = no

auth_mechanisms = plain login

#!include auth-system.conf.ext

!include auth-sql.conf.ext

Edit /etc/dovecot/conf.d/10-mail.conf

mail_location = maildir:/home/vmail/%d/%n:INDEX=/home/vmail/%d/%n/indexes

Edit /etc/dovecot/conf.d/10-ssl.conf

ssl = yes

Edit /etc/dovecot/conf.d/20-imap.conf

mail_max_userip_connections = 10

Edit /etc/dovecot/conf.d/auth-sql.conf.ext

passdb {

driver = sql

# Path for SQL configuration file, see example-config/dovecot-sql.conf.ext

args = /etc/dovecot/dovecot-mysql.conf.ext

}

userdb {

driver = sql

args = /etc/dovecot/dovecot-mysql.conf.ext

}

Edit /etc/dovecot/conf.d/10-master.conf

service lmtp {

unix_listener /var/spool/postfix/private/dovecot-lmtp {

mode = 0600

user = postfix

group = postfix

}

}

service auth {

# Postfix smtp-auth

unix_listener /var/spool/postfix/private/auth {

mode = 0666

}

}

Restart services:

service dovecot restart

service postfix restart

You can now add a domain with PostfixAdmin and test your e-mail server.

Any errors are found in logfiles:

/var/log/auth.log

/var/log/mail.log

/var/log/syslog

8. Install Milters

apt-get install clamav-milter clamav-unofficial-sigs milter-greylist spamass-milter

 

clamav-milter:

Update ClamAv database and start the daemon:

freshclam

/etc/init.d/clamav-daemon start

Edit /etc/default/clamav-milter and uncomment the last line:

SOCKET_RWGROUP=postfix

Create a socket folder inside Postfix chroot environment:

mkdir /var/spool/postfix/clamav

chown clamav /var/spool/postfix/clamav

Configure ClamAv milter:

dpkg-reconfigure clamav-milter

Answer questions as follows:

Handle configuration automatically --> yes

User for daemon --> clamav

Additional groups --> none (empty field)

path to socket --> /var/spool/postfix/clamav/clamav-milter.ctl

group owner for the socket --> clamav

permissions (mode) for socket --> 660

remove stale socket --> yes

wait timeout for clamd --> 120

foreground --> no

chroot --> none (empty field)

pid file --> /var/run/clamav/clamav-milter.pid

temporary path --> /tmp

clamd socket --> unix:/var/run/clamav/clamd.ctl

hosts excluded for scanning --> none (empty field)

mail whitelist --> none (empty field)

action for "infected" mail --> reject

action on error --> defer

reason for rejection --> Rejecting harmful e-mail: %v found.

headers -> replace

log file --> /var/log/clamav/clamav-milter.log

disable log file locking --> no

maximum log file size --> 0

log time --> yes

use syslog --> no

log facility (type of syslog message) --> LOG_LOCAL6

verbose logging --> no

log level when infected --> off

log level when no threat --> off

size limit for scanned messages --> 25

Tell Postfix to use this new milter:

postconf -e 'smtpd_milters = unix:/clamav/clamav-milter.ctl'

postfix reload

 

spamass-milter:

Edit /etc/default/spamass-milter:

Add ‘-m’ so it won’t change the subject header.

Add ‘-r -1′ so Postfix rejects what SpamAssassin flags as spam.

Add ‘-l’ to avoid scanning e-mails sent by logged in users.

OPTIONS="-u spamass-milter -i 127.0.0.1 -m -r -1 -I"

Restart milter:

service spamass-milter restart

Add a dedicated user for SpamAssassin daemon:

adduser --shell /bin/false --home /var/lib/spamassassin --disabled-password --disabled-login --gecos "" spamd

Edit /etc/default/spamassassin:

ENABLED=1

OPTIONS="--create-prefs --max-children 5 --helper-home-dir=/var/lib/spamassassin -u spamd -g spamd"

CRON=1

Update rules and restart the daemon:

sa-update

service spamassassin restart

Tell Postfix to use new milter:

postconf -e 'smtpd_milters = unix:/clamav/clamav-milter.ctl, unix:/spamass/spamass.sock'

postfix reload

 

milter-greylist:

Edit /etc/milter-greylist/greylist.conf:

# For sendmail use the following two lines

#socket "/var/run/milter-greylist/milter-greylist.sock"

#user "smmsp"

# For Postfix uncomment the following two lines and comment out the

# sendmail ones above.

socket "/var/spool/postfix/milter-greylist/milter-greylist.sock" 660

user "greylist"

Edit /etc/default/milter-greylist:

ENABLED=1

SOCKET="/var/spool/postfix/milter-greylist/milter-greylist.sock"

Make a folder for the socket and restart milter:

mkdir /var/spool/postfix/milter-greylist

chmod 2755 /var/spool/postfix/milter-greylist

chown greylist:postfix /var/spool/postfix/milter-greylist

service milter-greylist restart

Tell Postfix to use the new milter:

postconf -e 'milter_connect_macros = i b j _ {daemon_name} {if_name} {client_addr}'

postconf -e 'smtpd_milters = unix:/milter-greylist/milter-greylist.sock, unix:/clamav/clamav-milter.ctl, unix:/spamass/spamass.sock'

postfix reload

9. Install RoundCube

wget 'http://downloads.sourceforge.net/project/roundcubemail/roundcubemail/0.9.4/roundcubemail-0.9.4.tar.gz?use_mirror=heanet'

mv roundcubemail-0.9.4.tar.gz?use_mirror=heanet roundcubemail-0.9.4.tar.gz

tar -zxvf roundcubemail-0.9.4.tar.gz

mv roundcubemail-0.9.4 rcb_733621

chown -R 1001.1001 rcb_733621

Open phpMyAdmin SQL window and paste:

CREATE DATABASE roundcube;

GRANT ALL PRIVILEGES ON roundcube.* TO roundcube@localhost IDENTIFIED BY '<rcpassword>';

FLUSH PRIVILEGES;

Add initial tables and data:

cd /home/clients_ssl/<subdomain.domain.tld>/www/rcb_733621

mysql -u roundcube -p roundcube < SQL/mysql.initial.sql

Go to https://<subdomain.domain.tld>/rcb_733621/installer/

See that your environment is ok and click Next.

On the ‘Create config’ page, you may want to change the following values:

product_name: <yourproductname>

support_url: <yoururl>

database name: roundcube

database password: <rcpassword>

default_host: localhost

smtp_server: localhost

language: en_US

Click Continue

Change the value in textarea to:

$rcmail_config['use_https'] = true;

Then copy all from textarea and paste the contents to main.inc.php and db.inc.php under /home/clients_ssl/<subdomain.domain.tld>/www/rcb_733621/config

Remove installer folder:

mv installer ../../

Open RoundCube at https://<subdomain.domain.tld>/rcb_733621/

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