Fedora 31
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Mail Server : Install Postfix
2019/11/21
 
Install Postfix to configure SMTP Server.
[1] Install Postfix.
[root@mail ~]#
dnf -y install postfix
[2] This example shows to configure SMTP-Auth to use Dovecot's SASL function.
[root@mail ~]#
vi /etc/postfix/main.cf
# line 95: uncomment and specify hostname

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

mydomain =
srv.world
# line 118: uncomment

myorigin = $mydomain
# line 135: change

inet_interfaces =
all
# line 138: change it if use only IPv4

inet_protocols =
ipv4
# line 183: add

mydestination = $myhostname, localhost.$mydomain, localhost
, $mydomain
# line 283: uncomment and specify your local network

mynetworks = 127.0.0.0/8,
10.0.0.0/24
# line 438: uncomment (use Maildir)

home_mailbox = Maildir/
# line 593: add

smtpd_banner = $myhostname ESMTP
# add to the end

# for example, limit an email size for 10M
message_size_limit = 10485760
# for example, limit a mailbox for 1G
mailbox_size_limit = 1073741824

# 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 ~]#
systemctl enable --now postfix

[3] If Firewalld is running, allow SMTP service. SMTP uses [25/TCP].
[root@mail ~]#
firewall-cmd --add-service=smtp --permanent

success
[root@mail ~]#
firewall-cmd --reload

success
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