I have issues with the R3 version.
I can not get Postfix to work with OEMM.
Somehow OEMM always wants to start sendmail even tough it is not installed.
When I try to run it it says "Can't open /etc/init.d/sendmail".
Also after this line "su - -c 'source bin/scripts/config.sh; echo $MTA' openemm" I get sendmail as output.
I made the Ubuntu VM new and did everything over again, I had the same issue.
I followed the steps, I just use localhost rather than a valid page, as the mails will be sent through another SMTP-Server.
It worked with Sendmail before, however on this VM Postfix won't work.
Can you help me with that?
Also I would recommend you to change something in the guide.
The guide says you have to run "alternatives --set mta /usr/sbin/sendmail.postfix", but "alternatives" is a Fedora command, you can't use it in Ubuntu.
However there is "update-alternatives" but it didn't work for me either, OEMM tried to start Postfix this time, but somehow it tells me the connection timed out, weird.
I use Ubuntu 16.04 LTS Server, so I have no GUI, wich makes things complicated, as there are simple GUI tools which would probably help, but I cannot use GUI on this one though.
I hope you can help me