On 3/29/20 4:26 AM, Linda Pagillo wrote: > Hi everyone. I hope all of you are staying healthy and safe. I want to > set up Postfix as a backup MX for a few of my Windows-based mail > servers. I have never done this before so I have been researching to see > what I could find. So far, the most complete instructions I have found > are here: > https://www.linuxbabe.com/mail-server/how-to-set-up-a-backup-email-server-postfix-ubuntu
The instruction given on the web page above contains screenshots of Ubuntu-specific configuration. This might work but hides the knowledge about all config directives needed to get it work. In general postfix's own documentation gives you more insight, e.g. this one: http://www.postfix.org/STANDARD_CONFIGURATION_README.html#backup Ciao, Michael.
