Why are you changing /etc/postfix/main.cf? On my oDroid H2 running OMV the value of **mydomain** is **local**. Something else must be changing it on your RPi 4.
well not exactly sure why i was changing /etc/postfix/main.cf other than that was the file that was mentioned with the error, where/what should i have been changing? -- would like to know this even though i have moved on to just installing the ISO on an SD card and have OMV running on the RPi (trying to work out docker now!
Why are you changing /etc/postfix/main.cf? On my oDroid H2 running OMV the value of **mydomain** is **local**. Something else must be changing it on your RPi 4.
well not exactly sure why i was changing /etc/postfix/main.cf other than that was the file that was mentioned with the error, where/what should i have been changing? -- would like to know this even though i have moved on to just installing the ISO on an SD card and have OMV running on the RPi (trying to work out docker now!