Creating a Mail Server on Ubuntu 12.04

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Mail Server on Ubuntu 12.04 (Postfix, Courier, SSL/TLS, SpamAssassin, ClamAV, Amavis, Roundcube)

Introduction

Main components:

  • Postfix is the mail transfer agent (MTA) responsible for accepting new messages and storing them on your server as well as allowing authorised users to send e-mail.
  • Courier sits in front of Postfix and provides an IMAP and POP3 interface for clients to connect to.
  • SASL with SSL and TLS allows you to authenticate and communicate with the mail server securely.
  • SpamAssassin will analyse your e-mails as they arrive and will filter out what it thinks is spam.
  • ClamAV will scan e-mails for viruses before delivering it to your inbox.
  • Amavis ties SpamAssasin and ClamAV together, and is itself hooked into Postfix.
  • MySQL will be used to manage user accounts and e-mail forwarding.
  • Roundcube is the mail interface similar like Squirrelmail

Install required packages from repo

 apt-get update
 apt-get install -y mysql-server postfix postfix-mysql libsasl2-modules libsasl2-modules-sql libgsasl7 libauthen-sasl-cyrus-perl sasl2-bin libpam-mysql clamav-base libclamav6 clamav-daemon clamav-freshclam amavisd-new spamassassin spamc courier-base courier-authdaemon courier-authlib-mysql courier-imap courier-imap-ssl courier-pop courier-pop-ssl courier-ssl php-pear php-auth-sasl php-net-smtp php5-intl php5-mcrypt 
sudo pear install Mail_Mime
sudo pear install Mail_mimeDecode
sudo pear install channel://pear.php.net/Net_IDNA2-0.1.1

During the installation of MySQL you will be prompted for the root user password

File:Mail 1.png

Enter a secure password, and don’t forget it!

Similarly, during the installation of Courier you will be presented with the following configuration prompts

File:Mail 2.png

Choose No

File:Mail 3.png

Choose OK

File:Mail 4.png

Choose Internet Site

File:Mail 5.png

Enter your mail server name (e.g. replace mail.example.com with your own domain). Make sure you have this subdomain configured in your DNS records.

File:Mail 6.png

Choose OK

After everything has finished, we can proceed to configure our mail server.

Configuration

Postfix

First, we create file name main.cf

mv /etc/postfix/main.cf{,.default}
nano /etc/postfix/main.cf

Copy/paste the following (change all instances of mail.yourdomain.com):

myorigin = /etc/mailname
smtpd_banner = $myhostname ESMTP $mail_name
biff = no
append_dot_mydomain = no
readme_directory = no
mydestination =
relayhost =
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mynetworks_style = host
mailbox_size_limit = 0
virtual_mailbox_limit = 0
recipient_delimiter = +
inet_interfaces = all
inet_protocols = all
message_size_limit = 0

# SMTP Authentication (SASL)

smtpd_sasl_auth_enable = yes
broken_sasl_auth_clients = yes
smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain =

# Encrypted transfer (SSL/TLS)

smtp_use_tls = yes
smtpd_use_tls = yes
smtpd_tls_cert_file = /etc/ssl/private/mail.yourdomain.com.crt
smtpd_tls_key_file = /etc/ssl/private/mail.yourdomain.com.key
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

# Basic SPAM prevention

smtpd_helo_required = yes
smtpd_delay_reject = yes
disable_vrfy_command = yes
smtpd_sender_restrictions = permit_sasl_authenticated, permit_mynetworks, permit
smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination

# Force incoming mail to go through Amavis

content_filter = amavis:[127.0.0.1]:10024
receive_override_options = no_address_mappings

# Virtual user mappings

alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
virtual_mailbox_base = /var/spool/mail/virtual
virtual_mailbox_maps = mysql:/etc/postfix/maps/user.cf
virtual_uid_maps = static:5000
virtual_gid_maps =  static:5000
virtual_alias_maps = mysql:/etc/postfix/maps/alias.cf
virtual_mailbox_domains = mysql:/etc/postfix/maps/domain.cf

Next, we edit file master.cf

mv /etc/postfix/master.cf{,.default}
nano /etc/postfix/master.cf

Copy/paste the following (no changes is required):

#
#
# Postfix master process configuration file.  For details on the format
# of the file, see the master(5) manual page (command: "man 5 master").
#
# Do not forget to execute "postfix reload" after editing this file.
#
# ==========================================================================
# service type  private unpriv  chroot  wakeup  maxproc command + args
#               (yes)   (yes)   (yes)   (never) (100)
# ==========================================================================
smtp      inet  n       -       -       -       -       smtpd
smtps     inet  n       -       -       -       -       smtpd
  -o smtpd_tls_wrappermode=yes
submission inet n       -       -       -       -       smtpd
pickup    fifo  n       -       -       60      1       pickup
  -o content_filter=
  -o receive_override_options=no_header_body_checks
cleanup   unix  n       -       -       -       0       cleanup
qmgr      fifo  n       -       n       300     1       qmgr
tlsmgr    unix  -       -       -       1000?   1       tlsmgr
rewrite   unix  -       -       -       -       -       trivial-rewrite
bounce    unix  -       -       -       -       0       bounce
defer     unix  -       -       -       -       0       bounce
trace     unix  -       -       -       -       0       bounce
verify    unix  -       -       -       -       1       verify
flush     unix  n       -       -       1000?   0       flush
proxymap  unix  -       -       n       -       -       proxymap
proxywrite unix -       -       n       -       1       proxymap
smtp      unix  -       -       -       -       -       smtp
# When relaying mail as backup MX, disable fallback_relay to avoid MX loops
relay     unix  -       -       -       -       -       smtp
	-o smtp_fallback_relay=
showq     unix  n       -       -       -       -       showq
error     unix  -       -       -       -       -       error
retry     unix  -       -       -       -       -       error
discard   unix  -       -       -       -       -       discard
local     unix  -       n       n       -       -       local
virtual   unix  -       n       n       -       -       virtual
lmtp      unix  -       -       -       -       -       lmtp
anvil     unix  -       -       -       -       1       anvil
scache    unix  -       -       -       -       1       scache
#
# ====================================================================
# Interfaces to non-Postfix software. Be sure to examine the manual
# pages of the non-Postfix software to find out what options it wants.
#
# Many of the following services use the Postfix pipe(8) delivery
# agent.  See the pipe(8) man page for information about ${recipient}
# and other message envelope options.
# ====================================================================
#
# maildrop. See the Postfix MAILDROP_README file for details.
# Also specify in main.cf: maildrop_destination_recipient_limit=1
#
maildrop  unix  -       n       n       -       -       pipe
  flags=DRhu user=vmail argv=/usr/bin/maildrop -d ${recipient}
#
# See the Postfix UUCP_README file for configuration details.
#
uucp      unix  -       n       n       -       -       pipe
  flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
#
# Other external delivery methods.
#
ifmail    unix  -       n       n       -       -       pipe
  flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)
bsmtp     unix  -       n       n       -       -       pipe
  flags=Fq. user=bsmtp argv=/usr/lib/bsmtp/bsmtp -t$nexthop -f$sender $recipient
scalemail-backend unix	-	n	n	-	2	pipe
  flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store ${nexthop} ${user} ${extension}
mailman   unix  -       n       n       -       -       pipe
  flags=FR user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py
  ${nexthop} ${user}
amavis    unix -        -       -       -       2       smtp
  -o smtp_data_done_timeout=1200
  -o smtp_send_xforward_command=yes
  -o disable_dns_lookups=yes
  -o max_use=20
127.0.0.1:10025 inet n  -       -       -       -       smtpd
  -o content_filter=
  -o local_recipient_maps=
  -o relay_recipient_maps=
  -o smtpd_restriction_classes=
  -o smtpd_delay_reject=no
  -o smtpd_client_restrictions=permit_mynetworks,reject
  -o smtpd_helo_restrictions=
  -o smtpd_sender_restrictions=
  -o smtpd_recipient_restrictions=permit_mynetworks,reject
  -o smtpd_data_restrictions=reject_unauth_pipelining
  -o smtpd_end_of_data_restrictions=
  -o mynetworks=127.0.0.0/8
  -o smtpd_error_sleep_time=0
  -o smtpd_soft_error_limit=1001
  -o smtpd_hard_error_limit=1000
  -o smtpd_client_connection_count_limit=0
  -o smtpd_client_connection_rate_limit=0
  -o receive_override_options=no_header_body_checks,no_unknown_recipient_checks

As all our mail users are going to be virtual (i.e. we’re not going to create physical user accounts for each user), we only need to create one mail directory and one user account.

groupadd virtual -g 5000
useradd -r -g "virtual" -G "users" -c "Virtual User" -u 5000 virtual
mkdir /var/spool/mail/virtual
chown virtual:virtual /var/spool/mail/virtual

Now we’ll create the database which will store the mail user configuration and forwarding rules. Enter the password you created during the MySQL installation. Copy/paste the following (change mailuserpassword, yourdomain.com and admin password to something more secure)

CREATE DATABASE mail;
GRANT ALL ON mail.* TO [email protected] IDENTIFIED BY 'mailuserpassword';
FLUSH PRIVILEGES;
USE mail;

CREATE TABLE IF NOT EXISTS `alias` (`source` VARCHAR(255) NOT NULL, `destination` VARCHAR(255) NOT NULL DEFAULT "", `enabled` TINYINT UNSIGNED NOT NULL DEFAULT 1, PRIMARY KEY (`source`)) ENGINE=MyISAM DEFAULT CHARSET=utf8;
CREATE TABLE IF NOT EXISTS `domain` (`domain` VARCHAR(255) NOT NULL DEFAULT "", `transport` VARCHAR(255) NOT NULL DEFAULT "virtual:", `enabled` TINYINT UNSIGNED NOT NULL DEFAULT 1, PRIMARY KEY (`domain`)) ENGINE=MyISAM DEFAULT CHARSET=utf8;

CREATE TABLE IF NOT EXISTS `user` (`email` VARCHAR(255) NOT NULL DEFAULT "", `password` VARCHAR(255) NOT NULL DEFAULT "", `name` VARCHAR(255) DEFAULT NULL, `quota` INT UNSIGNED DEFAULT NULL, `enabled` TINYINT UNSIGNED NOT NULL DEFAULT 1, PRIMARY KEY (`email`)) ENGINE=MyISAM DEFAULT CHARSET=utf8;

INSERT INTO `alias` (`source`, `destination`, `enabled`) VALUES ('@localhost', '[email protected]', 1);
INSERT INTO `alias` (`source`, `destination`, `enabled`) VALUES ('@localhost.localdomain', '@localhost', 1);
INSERT INTO `domain` (`domain`, `transport`, `enabled`) VALUES ('localhost', 'virtual:', 1);
INSERT INTO `domain` (`domain`, `transport`, `enabled`) VALUES ('localhost.localdomain', 'virtual:', 1);
INSERT INTO `domain` (`domain`, `transport`, `enabled`) VALUES ('yourdomain.com', 'virtual:', 1);
INSERT INTO `user` (`email`, `password`, `name`, `quota`, `enabled`) VALUES ('[email protected]', ENCRYPT('adminpassword'), 'Administrator', NULL, 1);

Now that the database is in place we can create the map files to tell Postfix how to communicate with it.

mkdir /etc/postfix/maps
nano /etc/postfix/maps/alias.cf

Copy/paste the following (change mailuserpassword):

user=mail
password=mailuserpassword
dbname=mail
table=alias
select_field=destination
where_field=source
hosts=127.0.0.1
additional_conditions=and enabled = 1
nano /etc/postfix/maps/domain.cf

Copy/paste the following (change mailuserpassword):

user = mail
password = mailuserpassword
dbname = mail
table = domain
select_field = domain
where_field = domain
hosts = 127.0.0.1
additional_conditions = and enabled = 1

We create file name user.cf

nano /etc/postfix/maps/user.cf

Copy/paste the following (change mailuserpassword):

user = mail
password = mailuserpassword
dbname = mail
table = user
select_field = CONCAT(SUBSTRING_INDEX(email,'@',-1),'/',SUBSTRING_INDEX(email,'@',1),'/')
where_field = email
hosts = 127.0.0.1
additional_conditions = and enabled = 1

Set restrictive read permissions as these files contain the MySQL mail user’s password.

chmod 700 /etc/postfix/maps/*
chown postfix:postfix /etc/postfix/maps/*

SASL

The final part of configuring Postfix is to configure the authentication mechanism. SASL is a authentication layer that provides the ability to receive a user’s credentials in a variety of formats.

mkdir -p /var/spool/postfix/var/run/saslauthd
mkdir /etc/postfix/sasl
adduser postfix sasl
nano /etc/postfix/sasl/smtpd.conf

Copy/paste the following (change mailuserpassword):

pwcheck_method: saslauthd
auxprop_plugin: sql
mech_list: plain login
sql_engine: mysql
sql_hostnames: 127.0.0.1
sql_user: mail
sql_passwd: mailuserpassword
sql_database: mail
sql_select: SELECT password FROM user WHERE email='%[email protected]%r' AND enabled = 1

Change file permission:

chmod -R 700 /etc/postfix/sasl/smtpd.conf
mv /etc/default/saslauthd{,.default}
nano /etc/default/saslauthd

Copy/paste the following (no changes required):

START=yes
DESC="SASL Authentication Daemon"
NAME="saslauthd"
MECHANISMS="pam"
MECH_OPTIONS=""
THREADS=5
OPTIONS="-r -c -m /var/spool/postfix/var/run/saslauthd"
nano /etc/pam.d/smtp

Copy/paste the following (change all instances of mailuserpassword):

auth    required   pam_mysql.so user=mail passwd=mailuserpassword host=127.0.0.1 db=mail table=user usercolumn=email passwdcolumn=password crypt=1
account sufficient pam_mysql.so user=mail passwd=mailuserpassword host=127.0.0.1 db=mail table=user usercolumn=email passwdcolumn=password crypt=1

Change file permission:

chmod 700 /etc/pam.d/smtp

Courier

Now let’s configure Courier. I like to provide both IMAP and POP3 support, although personally I only use IMAP. In addition, we’ll be provide SSL support for securing authentication requests.

mv /etc/courier/authdaemonrc{,.default}
nano /etc/courier/authdaemonrc

Copy/paste the following (no changes required):

authmodulelist="authmysql"
authmodulelistorig="authuserdb authpam authpgsql authldap authmysql authcustom authpipe"
daemons=5
authdaemonvar=/var/run/courier/authdaemon
DEBUG_LOGIN=0
DEFAULTOPTIONS=""
LOGGEROPTS=""
mv /etc/courier/authmysqlrc{,.default}
nano /etc/courier/authmysqlrc

Copy/paste the following (change mailuserpassword):

MYSQL_SERVER localhost
MYSQL_USERNAME mail
MYSQL_PASSWORD mailuserpassword
MYSQL_PORT 0
MYSQL_DATABASE mail
MYSQL_USER_TABLE user
MYSQL_CRYPT_PWFIELD password
MYSQL_UID_FIELD 5000
MYSQL_GID_FIELD 5000
MYSQL_LOGIN_FIELD email
MYSQL_HOME_FIELD "/var/spool/mail/virtual"
MYSQL_MAILDIR_FIELD CONCAT(SUBSTRING_INDEX(email,'@',-1),'/',SUBSTRING_INDEX(email,'@',1),'/')
MYSQL_NAME_FIELD name
MYSQL_QUOTA_FIELD quota
mv /etc/courier/imapd{,.default}
nano /etc/courier/imapd

Copy/paste the following (no changes required):

ADDRESS=0
PORT=143
MAXDAEMONS=40
MAXPERIP=20
PIDFILE=/var/run/courier/imapd.pid
TCPDOPTS="-nodnslookup -noidentlookup"
LOGGEROPTS="-name=imapd"
IMAP_CAPABILITY="IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE"
IMAP_KEYWORDS=1
IMAP_ACL=1
IMAP_CAPABILITY_ORIG="IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA AUTH=CRAM-MD5 AUTH=CRAM-SHA1 AUTH=CRAM-SHA256 IDLE"
IMAP_PROXY=0
IMAP_PROXY_FOREIGN=0
IMAP_IDLE_TIMEOUT=60
IMAP_MAILBOX_SANITY_CHECK=0
IMAP_CAPABILITY_TLS="$IMAP_CAPABILITY AUTH=PLAIN"
IMAP_CAPABILITY_TLS_ORIG="$IMAP_CAPABILITY_ORIG AUTH=PLAIN"
IMAP_DISABLETHREADSORT=0
IMAP_CHECK_ALL_FOLDERS=0
IMAP_OBSOLETE_CLIENT=0
IMAP_UMASK=022
IMAP_ULIMITD=65536
IMAP_USELOCKS=1
IMAP_SHAREDINDEXFILE=/etc/courier/shared/index
IMAP_ENHANCEDIDLE=0
IMAP_TRASHFOLDERNAME=Trash
IMAP_EMPTYTRASH=Trash:7
IMAP_MOVE_EXPUNGE_TO_TRASH=0
SENDMAIL=/usr/sbin/sendmail
HEADERFROM=X-IMAP-Sender
IMAPDSTART=YES
MAILDIRPATH=Maildir
mv /etc/courier/imapd-ssl{,.default}
nano /etc/courier/imapd-ssl

Copy/paste the following (change mail.yourdomain.com):

SSLPORT=993
SSLADDRESS=0
SSLPIDFILE=/var/run/courier/imapd-ssl.pid
SSLLOGGEROPTS="-name=imapd-ssl"
IMAPDSSLSTART=YES
IMAPDSTARTTLS=YES
IMAP_TLS_REQUIRED=0
COURIERTLS=/usr/bin/couriertls
TLS_KX_LIST=ALL
TLS_COMPRESSION=ALL
TLS_CERTS=X509
TLS_CERTFILE=/etc/ssl/private/mail.yourdomain.com.pem
TLS_TRUSTCERTS=/etc/ssl/certs
TLS_VERIFYPEER=NONE
TLS_CACHEFILE=/var/lib/courier/couriersslcache
TLS_CACHESIZE=524288
MAILDIRPATH=Maildir
mv /etc/courier/pop3d{,.default}
nano /etc/courier/pop3d

Copy/paste the following (no changes required):

PIDFILE=/var/run/courier/pop3d.pid
MAXDAEMONS=40
MAXPERIP=4
POP3AUTH="LOGIN"
POP3AUTH_ORIG="PLAIN LOGIN CRAM-MD5 CRAM-SHA1 CRAM-SHA256"
POP3AUTH_TLS="LOGIN PLAIN"
POP3AUTH_TLS_ORIG="LOGIN PLAIN"
POP3_PROXY=0
PORT=110
ADDRESS=0
TCPDOPTS="-nodnslookup -noidentlookup"
LOGGEROPTS="-name=pop3d"
POP3DSTART=YES
MAILDIRPATH=Maildir
mv /etc/courier/pop3d-ssl{,.default}
nano /etc/courier/pop3d-ssl

Copy/paste the following (change mail.yourdomain.com):

SSLPORT=995
SSLADDRESS=0
SSLPIDFILE=/var/run/courier/pop3d-ssl.pid
SSLLOGGEROPTS="-name=pop3d-ssl"
POP3DSSLSTART=YES
POP3_STARTTLS=YES
POP3_TLS_REQUIRED=0
COURIERTLS=/usr/bin/couriertls
TLS_STARTTLS_PROTOCOL=TLS1
TLS_KX_LIST=ALL
TLS_COMPRESSION=ALL
TLS_CERTS=X509
TLS_CERTFILE=/etc/ssl/private/mail.yourdomain.com.pem
TLS_TRUSTCERTS=/etc/ssl/certs
TLS_VERIFYPEER=NONE
TLS_CACHEFILE=/var/lib/courier/couriersslcache
TLS_CACHESIZE=524288
MAILDIRPATH=Maildir

SSL

We need to create SSL certificates for Courier to use when authenticating using SSL/TLS. You can either purchase these (to prevent "invalid" certificate warnings) or generate a self-signed certificate which is just as secure, and free.

You will be prompted to input some information about the certificates you create. You can enter any information you want here except Common Name (CN) which must be your mailname (e.g. mail.yourdomain.com).

Run the following (change mail.yourdomain.com):

1. Remove default certificates

rm -f /etc/courier/imapd.cnf
rm -f /etc/courier/imapd.pem
rm -f /etc/courier/pop3d.cnf
rm -f /etc/courier/pop3d.pem

2. Generate a new PEM certificate (valid for 10 years)

openssl req -x509 -newkey rsa:1024 -keyout "/etc/ssl/private/mail.yourdomain.com.pem" -out "/etc/ssl/private/mail.example.com.pem" -nodes -days 3650

3. Generate a new CRT certificate (valid for 10 years)

openssl req -new -outform PEM -out "/etc/ssl/private/mail.yourdomain.com.crt" -newkey rsa:2048 -nodes -keyout "/etc/ssl/private/mail.example.com.key" -keyform PEM -days 3650 -x509
chmod 640 /etc/ssl/private/mail.yourdomain.com.*
chgrp ssl-cert /etc/ssl/private/mail.yourdomain.com.*

Amavis

Next we’ll configure Amavis, the software that ties together SpamAssassin and ClamAV with Postfix.

adduser clamav amavis
cat /dev/null > /etc/amavis/conf.d/15-content-filter-mode
nano /etc/amavis/conf.d/15-content-filter-mode

Copy/paste the following (no changes required):

use strict;

$log_level = 1;
$sa_kill_level_deflt = 6.5;
$final_spam_destiny = D_DISCARD;
$pax = 'pax';

@bypass_virus_checks_maps = (\%bypass_virus_checks, \@bypass_virus_checks_acl, \$bypass_virus_checks_re);
@bypass_spam_checks_maps = (\%bypass_spam_checks, \@bypass_spam_checks_acl, \$bypass_spam_checks_re);
@local_domains_acl = qw(.);

1;
cat /dev/null > /etc/amavis/conf.d/50-user
nano /etc/amavis/conf.d/50-user

Copy/paste the following (no changes required):

use strict;

@local_domains_acl = qw(.);
$log_level = 1;
$syslog_priority = 'info';
$sa_kill_level_deflt = 6.5;
$final_spam_destiny = D_DISCARD;
$pax = 'pax';

1;
mv /etc/default/spamassassin{,.default}
nano /etc/default/spamassassin

Copy/paste the following (no changes required):

ENABLED=1
OPTIONS="--create-prefs --max-children 5 --helper-home-dir"
PIDFILE="/var/run/spamd.pid"
CRON=0

ClamAV

ClamAV will scan e-mails for viruses before delivering it to your inbox.

Now, let's configure our ClamAV:

dpkg-reconfigure clamav-freshclam

After that, it will show you a console with an options. Select the settings accordingly:

File:Clamav 1.png

Choose OK

File:Clamav 2.png

Choose daemon

File:Clamav 3.png

Choose a mirror closest to you

File:Clamav 4.png

Enter your proxy, if required. Usually you will leave this blank

File:Clamav 5.png

By default, ClamAV updates every hour. That’s excessive. Bring that down to once a day

File:Clamav 6.png

Choose No

Now restart everything

sudo /etc/init.d/saslauthd restart
sudo /etc/init.d/postfix restart
sudo /etc/init.d/courier-authdaemon restart
sudo /etc/init.d/courier-imap restart
sudo /etc/init.d/courier-imap-ssl restart
sudo service amavis restart

Testing

Now Postfix is running properly. So it should accept connections on port 25(SMTP port), and send email anywhere in the world.

So let's try telnet to our server via port 25 and send a test email:

$ telnet mail.yourdomain.com 25

Trying mail.yourdomain.com...

Connected to mail.yourdomain.com.
Escape character is '^]'.
220 mail.yourdomain.com ESMTP Postfix
HELO localhost
250 mail.yourdomain.com
MAIL FROM: <[email protected]>
250 2.1.0 Ok
RCPT TO: <[email protected]>
250 2.1.5 Ok
DATA
354 End data with <CR><LF>.<CR><LF>
Subject: Test email

Testmail to ensure Postfix is working.
.
250 2.0.0 Ok: queued as 6705C20E32
QUIT
221 2.0.0 Bye

Connection closed by foreign host.

So this proving that our email is working properly.

But is some cases, you may encounter something like this during test sending email to another domain:

$ telnet mail.yourdomain.com 25

Trying mail.yourdomain.com...

Connected to mail.yourdomain.com.
Escape character is '^]'.
220 mail.yourdomain.com ESMTP Postfix
HELO localhost
250 mail.yourdomain.com
MAIL FROM: <[email protected]>
250 2.1.0 Ok
RCPT TO: <[email protected]>
454 4.7.1 <[email protected]>: Relay access denied
QUIT
221 2.0.0 Bye

Connection closed by foreign host.

This may cause by misconfiguration during the setup or your server has blocked the port 25.

Do check your firewall and allow connection to and from port 25.

Errors will usually show up in:

/var/log/mail.log
/var/log/mail.err

Roundcube

Download Roundcube file from http://roundcube.net/download :

wget http://downloads.sourceforge.net/project/roundcubemail/roundcubemail/1.1.0/roundcubemail-1.1.0.tar.gz
tar xvfz roundcubemail-1.1.0.tar.gz
cd roundcubemail-1.1.0
mv roundcubemail-1.1.0 mail

It is recommended to make the document root and the Roundcube files in it writable by the running as user www-data and group www-data:

chown -R www-data:www-data /var/www/mail

If you haven't already created a MySQL database for Roundcube (including a MySQL Roundcube user), you can do that as follows:

mysqladmin -u root -p create roundcube
mysql -u root -p
GRANT ALL PRIVILEGES ON roundcube.* TO 'roundcube_admin'@'localhost' IDENTIFIED BY 'roundcube_password';
GRANT ALL PRIVILEGES ON roundcube.* TO 'roundcube_admin'@'localhost.localdomain' IDENTIFIED BY 'roundcube_password';
FLUSH PRIVILEGES;
quit;

Edit php.ini:

sudo nano /etc/php5/apache2/php.ini

Add this to the end of file:

extension=mcrypt.so

Edit timezone:

date.timezone = "Asia/Kuala_Lumpur"

Now we can launch the web-based Roundcube installer by going to http://yourdomain/mail/installer/

File:Roundcube 1.png

Scroll down and click on START INSTALLATION

File:Roundcube 2.png

On the next page the installer checks if your environment fulfills all prerequisites.

File:Roundcube 3.png

If everyting is ok, scroll down and click on NEXT

File:Roundcube 4.png

On the next page you can configure. Most default settings should be ok. Scroll down to the Database setup section and fill in the details for the Roundcube MySQL database that we've previously created

File:Roundcube 5.png

Then go to the IMAP Settings section and fill in the details of your IMAP server. If it is located on the same server, fill in localhost in the default_host field. If you want to use IMAPS (port 993), prepend the hostname with ssl:// and change the default_port field to 993

File:Roundcube 6.png

Under SMTP Settings fill in your SMTP server (localhost if it's on the same host). If the SMTP server uses the same login details as your IMAP server, please check Use the current IMAP username and password for SMTP authentication

File:Roundcube 7.png

If all other settings are ok (as I mentioned before, the default settings in all other sections should be fine), click on the CREATE CONFIG button

File:Roundcube 8.png

On the next page you will see two configuration files (main.inc.php and db.inc.php). Copy the contents and create both files in the config directory (/var/www/mail/config/ in this case):

nano /var/www/mail/config/main.inc.php
nano /var/www/mail/config/db.inc.php

File:Roundcube 9.png

After you have created both files, click on CONTINUE

File:Roundcube 10.png

On the next page, click on the Initialize database button to make the installer create the Roundcube MySQL database

File:Roundcube 11.png

Finally (this is optional) you have the possibility to test your SMTP and IMAP login

File:Roundcube 12.png

After the installation has finished, you should delete the Roundcube installer directory:

rm -rf /var/www/mail/installer/

Now you can go to http://yourdomain.com/mail/ and use Roundcube to log into your email account

File:Roundcube 13.png

This is how Roundcube looks

File:Roundcube 14.png

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