Configure postfix as a backup for Exchange

  • I want to use postfix on a virtual server as a backup in case my Exchange is down. Postfix should accept every mail and deliver it to the Exchange server instantly or wait until the Exchange server is available.
  • Existing postfix installation
  • Existing Exchange installation

  • Login to your virtual server via ssh.

  • Create and open the file /etc/postfix/transport
  • Insert domain.com smtp:exchangehost.name for every domain you want to relay on its own line.
  • Run postmap /etc/postfix/transport

  • Edit /etc/postfix/main.cf
  • Insert relay_domains = domain.com. If you want multiple domains, separate them with a space.
  • Insert transport_maps = hash:/etc/postfix/transport
  • Run /etc/init.d/postfix reload
  • tutorial/mail/postfixredir.txt
  • Last modified: 2016-04-03 23:00
  • by Nico Weichbrodt