instalasi / migrasi server email dengan Ubuntu 12.04 LTS, postfix dovecot, squirrelmail

 Set network ke yang bisa internetan.

Setel /etc/apt/sources.list agar bisa update, misal ke alamat old-releases.ubuntu.com. untuk ubuntu 12.04:

deb http://old-releases.ubuntu.com/ubuntu/ precise main restricted multiverse universe

deb http://old-releases.ubuntu.com/ubuntu/ precise-updates main restricted multiverse universe

jalankan satu satu :

apt-get update

apt-get upgrade

apt-get install ssh apache2 php5

apt-get install postfix 

Perhatikan setelan dari /etc/postfix/main.cf terutama untuk (asumsi nama domain adalah bagus.com), dengan network lokalnya 192.168.xxx.xxx:

mydomain = bagus.com

myhostname = mail.bagus.com

myorigin = bagus.com

alias_maps = hash:/etc/aliases

alias_database = hash:/etc/aliases

mydestination = localhost, bagus.com

mynetworks = 127.0.0.0/8, 192.168.0.0/16

smtpd_sasl_exceptions_networks = $mynetworks

relay_domains = $mydestination

header_checks = regexp:/etc/postfix/header_checks

file /etc/postfix/header_checks contoh isinya:

/^Subject: .*been hacked/ DISCARD 550 User unknown

/^From: .*SureVoIP/ DISCARD 550 User unknown

Lalu jalankan untuk dovecot

apt-get install dovecot-core dovecot-imapd dovecot-pop3d

dil file /etc/dovecot/conf.d/10-auth.conf kalau tidak ingin pakai TLS:

disable_plaintext_auth = no

auth_mechanisms = plain login

di file /etc/dovecot/conf.d/10-master.conf, hilangkan # di contohnya IMAPS:

inet_listener imaps {

    #port = 993

    #ssl = yes

  }

di file /etc/dovecot/conf.d/10-mail.conf boleh pakai:

mail_location = mbox:~/mail:INBOX=/var/mail/%u

Jalankan perintah 

squirrelmail-configure

Terutama untuk bagian server, pilih model dovecot untuk IMAP servernya. Lalu jalankan:

cp /etc/squirrelmail/apache.conf /etc/apache2/sites-available/squirrelmail.conf

a2ensite squirrelmail.conf

service apache2 reload

Jalankan squirrelmail lewat http://alamatnya/squirrelmail

Kalau misal migrasi, bisa copykan isi /etc/passwd dan /etc/shadow ke komputer yang baru, tapi editnya pakai vi . 

Karena user baru nggak ada home, maka setel:

chmod 777 /home

chmod 777 /var/mail

kalau untuk forward port dari luar bisa pakai /etc/iptables.rules

# Generated by iptables-save v1.3.3 on Fri Nov 15 13:32:49 2013

*nat

:PREROUTING ACCEPT [428:47001]

:POSTROUTING ACCEPT [5:559]

:OUTPUT ACCEPT [5:559]

-A PREROUTING -i eth1 -p tcp -m tcp --dport 1110 -j REDIRECT --to-ports 110

-A PREROUTING -i eth1 -p tcp -m tcp --dport 3310 -j REDIRECT --to-ports 110

-A PREROUTING -i eth1:1 -p tcp -m tcp --dport 1110 -j REDIRECT --to-ports 110

-A PREROUTING -i eth1:1 -p tcp -m tcp --dport 3110 -j REDIRECT --to-ports 110

-A INPUT -s 80.94.95.204 -j DROP

-A INPUT -s 176.111.173.25 -j DROP

COMMIT

# Completed on Fri Nov 15 13:32:49 2013

Sumber:
https://www.alibabacloud.com/blog/how-to-setup-email-server-with-postfix%2C-dovecot%2C-directmail-and-squirrelmail-on-ubuntu-16-04-alibaba-ecs_594092