Postfix : Install / Configure2018/05/12

	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 -y install postfix sasl2-bin

# select [No Configuration], configure manually later

+------+ Postfix Configuration +-------+
| General type of mail configuration:  |
|                                      |
|       No configuration               |
|       Internet Site                  |
|       Internet with smarthost        |
|       Satellite system               |
|       Local only                     |
|                                      |
|                                      |
|       <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

# SMTP-Auth setting

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:~#

newaliases

root@mail:~#

systemctl restart postfix

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