Install postfix

sudo apt-get install postfix

Postfix Configuration: choose Internetsite.
Choose name of server.

Now postfix is installed an running.

Configure your smtp-server now.

sudo nano /etc/postfix/

Test postfix with telnet.

sudo apt-get install telnet

Then establish a TCP connetion to the SMTP port:

telnet localhost smtp

The server should reply:

Connected to localhost.
Escape character is '^]'.
220 mailtest ESMTP Postfix (Debian/GNU)

Great. Postfix is listening and wants us to speak SMTP. First we need to be friendly:


Postfix appreciates our friendliness and tells us which features it provides:


After a fresh installation you want access to your raids. Do it this way.

Install mdadm

sudo apt-get install mdadm

Reassemble your raids

sudo mdadm --assemble --scan

Edit your config.

sudo nano /etc/mdadm/mdadm.conf

Follow these instructions Md127 instead of Md0.
RAID starting at md127 instead of md0

sudo nano /etc/mdadm/mdadm.conf

Instead of this:
ARRAY /dev/md/0 metadata=1.2 name=nagelnas:0 UUID=e4665ceb:15f8e4b6:b186d497:7d365254

ARRAY /dev/md0 UUID=e4665ceb:15f8e4b6:b186d497:7d365254

You need to update initramfs so it contains your mdadm.conf settings during boot:

sudo update-initramfs -u

VirtualBox Guest Additions are a set of device drivers and system applications which are designed to be installed in the guest operating systems of VirtualBox. Guest Additions are available as an ISO image for Windows, Linux, Solaris or OS/2. The Guest Additions offer a number of features including:

  • Seamless mouse support across host and guest operating systems.
  • Shared folders/clipboard between host and guest operating systems.
  • High-resolution video modes as well as hardware-accelerated performance for 3D graphics and 2D video.
  • Time synchronization between host and guest operating systems.

In this tutorial, I will describe how to install VirtualBox Guest Additions for Linux.

I assume that you already