I renamed some install scripts to be more clear.
SPF: Suggest [MAILDOMAIN], [HOSTNAME] and [IP ADDRESS]
Its a better practice to be more inclusive when it comes
to dns SPF records.
DKIM: Some dns registrars truncate dns TXT records at
255 chars. So 2048bit do not fit (about 390 vs. 230 chars).
So 1024bit keys are a good choice, after all it is
only a mail verification mechanism, do not encrypt the mail...
Show tip how to stop systemd service (03_install_check_running_services.sh)
sudo su prefered to become root, sudo su fails with npm permission errors
when installing (dunno why).
A mini tutorial is shown at the end about SPF, DKIM and
how to add/remove/modify DKIM keys.
This pull request closes issue 85,86.
Fixed two issues:
82: need to install npm globally to get around permission problems
83: need to start nginx service before restarting it
Better executable requirements (lsof, ps). It may be not installed
on minimal systems.
Better service detection on given port. It is especially useful,
if the installation.sh got interrupted for some reason, and
already installed some services.
Minor doc update, so a single line is required to paste in terminal.
curl vs. wget -> stayed with wget, it is installed by default on ubuntu
Colors: added color support for the terminal output:)
