Mail Server : Install Postfix2021/07/30 |
Install Postfix to configure SMTP Server.
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[1] | Install Postfix. |
[root@mail ~]# dnf -y install postfix
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[2] | This example shows to configure SMTP-Auth settings to use Dovecot's SASL feature. |
[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 # hide the kind or version of SMTP software smtpd_banner = $myhostname ESMTP # add follows to the end # disable SMTP VRFY command disable_vrfy_command = yes # require HELO command to sender hosts smtpd_helo_required = yes # limit an email size # example below means 10M bytes limit message_size_limit = 10240000 # 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 success [root@mail ~]# firewall-cmd --runtime-to-permanent success |
[4] |
Configure additional settings for Postfix if you need.
However, you should consider to apply the settings,It's possible to reject many spam emails with the settings below. because sometimes normal emails are also rejected with them. Especially, there are SMTP servers that forward lookup and reverse lookup of their hostnames on DNS do not match even if they are not spammers. |
[root@mail ~]#
vi /etc/postfix/main.cf # add to the end # reject unknown clients that forward lookup and reverse lookup of their hostnames on DNS do not match smtpd_client_restrictions = permit_mynetworks, reject_unknown_client_hostname, permit # rejects senders that domain name set in FROM are not registered in DNS or # not registered with FQDN smtpd_sender_restrictions = permit_mynetworks, reject_unknown_sender_domain,reject_non_fqdn_sender # reject hosts that domain name set in FROM are not registered in DNS or # not registered with FQDN when your SMTP server receives HELO command smtpd_helo_restrictions = permit_mynetworks, reject_unknown_hostname,reject_non_fqdn_hostname, reject_invalid_hostname, permit systemctl restart postfix |
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