Ubuntu 16.04
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Install Postfix
2016/06/01
 
Install Postfix to configure SMTP Server. SMTP uses 25/TCP.
[1] This example shows to configure SMTP-Auth to use Dovecot's SASL function.
root@mail:~#
apt-get -y install postfix sasl2-bin
# select "No Configuration", configure manually later

        +------+ Postfix Configuration +-------+
        | General type of mail configuration:  |
        |                                      |
        |       No configuration               |
        |       Internet Site                  |
        |                                      |
        |                                      |
        |       <Ok>           <Cancel>        |
        |                                      |
        +--------------------------------------+

root@mail:~#
cp /usr/share/postfix/main.cf.dist /etc/postfix/main.cf

root@mail:~#
vi /etc/postfix/main.cf
# line 78: uncomment

mail_owner = postfix
# line 94: uncomment and specify hostname

myhostname =
mail.srv.world
# line 102: uncomment and specify domainname

mydomain =
srv.world
# line 123: uncomment

myorigin = $mydomain
# line 137: uncomment

inet_interfaces = all
# line 185: uncomment

mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
# line 228: uncomment

local_recipient_maps = unix:passwd.byname $alias_maps
# line 270: uncomment

mynetworks_style = subnet
# line 287: add your local network

mynetworks = 127.0.0.0/8,
10.0.0.0/24
# line 407: uncomment

alias_maps = hash:/etc/aliases
# line 418: uncomment

alias_database = hash:/etc/aliases
# line 440: uncomment

home_mailbox = Maildir/
# line 576: comment out and add

#
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
smtpd_banner = $myhostname ESMTP
# line 650: add

sendmail_path =
/usr/sbin/postfix
# line 655: add

newaliases_path =
/usr/bin/newaliases
# line 660: add

mailq_path =
/usr/bin/mailq
# line 666: add

setgid_group =
postdrop
# line 670: comment out

#
html_directory =
# line 674: comment out

#
manpage_directory =
# line 679: comment out

#
sample_directory =
# line 683: comment out

#
readme_directory =
# add to the end: limit an email size 10M

message_size_limit = 10485760

# limit mailbox 1G

mailbox_size_limit = 1073741824
# for SMTP-Auth settings

smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain = $myhostname
smtpd_recipient_restrictions = permit_mynetworks, permit_auth_destination, permit_sasl_authenticated, reject
root@mail:~#
root@mail:~#
systemctl restart postfix

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