Membuat Server MX Backup dengan Postfix

Dalam mengoperasikan mail server mungkin saja ada gangguan pada mail server utama misalnya incoming port 25 tertutup. Untuk mengatasinya kita membuat server mx backup dan kemudian meneruskan ke server utama melalui port lain.

Membuat Server untuk MX Backup dengan Postfix adalah seperti pada berikut ini

1. Silahkan instal postfix dengan tipe Internet Site
2. Pada /etc/postfix/main.cf bagian restriction

   1	smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination

3. Pada

   1	relay_domains = $mydestination, domainku.com

4. Pada

   1	relay_recipient_maps =

5. Seting relay host ke server utama melalui port lain

   1	relayhost = [204.233.95.52]:1190

6. Contoh lengkap konfigurasi lengkap

   1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

   # See /usr/share/postfix/main.cf.dist for a commented, more complete version     # Debian specific:  Specifying a file name will cause the first # line of that file to be used as the name.  The Debian default # is /etc/mailname. #myorigin = /etc/mailname   smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no   # appending .domain is the MUA's job. append_dot_mydomain = no   # Uncomment the next line to generate "delayed mail" warnings #delay_warning_time = 4h   readme_directory = no   # See http://www.postfix.org/COMPATIBILITY_README.html -- default to 2 on # fresh installs. compatibility_level = 2       # TLS parameters smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key smtpd_tls_security_level=may   smtp_tls_CApath=/etc/ssl/certs smtp_tls_security_level=may smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache     #smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination myhostname = server3.ult.id alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases myorigin = /etc/mailname mydestination = $myhostname, server3.ult.id, localhost.ultima.id, , localhost relay_domains = $mydestination, tokokue.com relay_recipient_maps = relayhost = [209.233.95.52]:1190 mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = all inet_protocols = all

Informasi lebih lanjut silahkan mengunjungi
1. https://www.howtoforge.com/postfix_backup_mx .
2. https://askubuntu.com/questions/1331555/which-option-internet-site-internet-with-smarthost-satellite-system-sh .
3. https://www.postfix.org/documentation.html .

Kunjungi www.proweb.co.id untuk menambah wawasan anda.