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CARA MENGINSTALL POSTFIX
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Setting up DNS
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    Type   Host    Destination             Priority   TTL
    MX     @       mail.yourdomain.com     10         3600
    A      mail    <ipaddress>                        3600

2. Masukkan perintah berikut :
yum -y update

hostname mail.yourdomain.com

nano /etc/hosts

Tambahkan di bawah : <ipaddress> mail.yourdomain.com

yum -y install postfix

mkdir /etc/postfix/ssl

cd /etc/postfix/ssl

yum -y install openssl

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openssl req -x509 -nodes -newkey rsa:2048 -keyout server.key -out server.crt -nodes -days 365
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    Generating a 2048 bit RSA private key
    ..........................+++
    ...........................+++
    writing new private key to 'server.key'
    -----
    You are about to be asked to enter information that will be incorporated
    into your certificate request.
    What you are about to enter is what is called a Distinguished Name or a DN.
    There are quite a few fields but you can leave some blank
    For some fields there will be a default value,
    If you enter '.', the field will be left blank.
    -----
    Country Name (2 letter code) [XX]:US
    State or Province Name (full name) []:New York
    Locality Name (eg, city) [Default City]:
    Organization Name (eg, company) [Default Company Ltd]:
    Organizational Unit Name (eg, section) []:My Unit
    Common Name (eg, your name or your server's hostname) []:localhost
    Email Address []:admin@localhost
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nano /etc/postfix/main.cf

Tambahkan di bawah :
myhostname = mail.yourdomain.com
mydomain = yourdomain.com
myorigin = $mydomain
home_mailbox = mail/
mynetworks = 127.0.0.0/8, <ipaddress>, [::1]/128 <==== SANGAT PENTING, TAMBAHKAN IP ADDRESS VPS
inet_interfaces = all
inet_protocols = all
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_sasl_local_domain =
smtpd_sasl_security_options = noanonymous
broken_sasl_auth_clients = yes
smtpd_sasl_auth_enable = yes
smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination
smtp_tls_security_level = may
smtpd_tls_security_level = may
smtp_tls_note_starttls_offer = yes
smtpd_tls_loglevel = 1
smtpd_tls_key_file = /etc/postfix/ssl/server.key
smtpd_tls_cert_file = /etc/postfix/ssl/server.crt
smtpd_tls_received_header = yes
smtpd_tls_session_cache_timeout = 3600s
tls_random_source = dev:/dev/urandom

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MENAMBAHKAN DOMAIN VIRTUAL
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nano /etc/postfix/main.cf

#virtual_alias_domains = domain1.com domain2.com domain3.com etc.
virtual_alias_domains = hash:/etc/postfix/virtual_domains
virtual_alias_maps = hash:/etc/postfix/virtual

nano  /etc/postfix/virtual_domains
## Tambahkan :
mydomain.com  #domain
myotherdomain.com  #domain
etc...

nano /etc/postfix/virtual
## Tambahkan :
@mydomain.com  andrian@gmail.com
@myotherdomain.com  agus@gmail.com
etc...

postmap /etc/postfix/virtual_domains; postmap /etc/postfix/virtual

------------------------
nano  /etc/postfix/master.cf
smtp      inet  n       -       n       -       -       smtpd
submission     inet  n       -       n       -       -       smtpd
 -o syslog_name=postfix/submission
 -o smtpd_sasl_auth_enable=yes
 -o smtpd_recipient_restrictions=permit_sasl_authenticated,reject
 -o milter_macro_daemon_name=ORIGINATING
smtps     inet  n       -       n       -       -       smtpd
 -o syslog_name=postfix/smtps
 -o smtpd_sasl_auth_enable=yes
 -o smtpd_recipient_restrictions=permit_sasl_authenticated,reject
 -o milter_macro_daemon_name=ORIGINATING
 
## Catatan : -o harus ada spasi di depannya
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INSTALL DOVECOT
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yum -y install dovecot

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

## Cari bagian  # Postfix smtp-auth
## Tambahkan :
  # Postfix smtp-auth
  unix_listener /var/spool/postfix/private/auth {
    mode = 0666
    user = postfix
    group = postfix
  }

nano /etc/dovecot/conf.d/10-auth.conf
## Cari bagian : auth_mechanisms = plain
## Ganti menjadi : auth_mechanisms = plain login

nano /etc/dovecot/conf.d/10-mail.conf
## Cari bagian : #mail_location =
## Ganti menjadi : mail_location = maildir:~/mail

nano /etc/dovecot/conf.d/20-pop3.conf
## Cari bagian : #pop3_uidl_format = %08Xu%08Xv
## Buang tanda # menjadi pop3_uidl_format = %08Xu%08Xv 

postmap /etc/postfix/virtual; postmap /etc/postfix/virtual_domains; postfix reload
systemctl restart postfix; systemctl restart dovecot

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TESTING KIRIM EMAIL
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telnet mail.hunianrumah.com smtp
mail from:ardi@cubbying.com
rcpt to:xiojin@gmail.com
data
Subject: Ini adalah ardi
Ini adalah isi pesan.
.

quit
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BACA LOG
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nano /var/log/maillog
echo > /var/log/maillog
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DAFTAR FILE PENTING
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nano /etc/postfix/main.cf
nano  /etc/postfix/master.cf
nano /etc/dovecot/dovecot.conf
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## Sintaks mynetworks = 
mynetworks = 127.0.0.0/8, 123.45.56.78, [::1]/128
123.45.56.78 ganti menjadi IP Address VPS kita
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