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In this post I would like to explain the usage of SPF (Sender Policy Framework), which could be used to prevent spam. SPF will use the DNS system to tell the receiving mail server, whether the sending server is allowed to send mails for this domain. As this is the basic concept, I will explain […]
In this post, I would like to show, how to use DKIM together with postfix to enhance the chance, that mails send by your mail server are not marked as spam at the receiver. In my last post, I showed how to set up postfix in front of scalix to filter incoming mails. As also […]
In this post I would like to show, how to set up Postfix and Dovecot in front of Scalix on a Debian system, for security and mail filter reasons. I assume, that you have a running Scalix installation and full management access. If you need help to install Scalix on Debian, you can use my last […]
In this post I would like to show, how to install Scalix on Debian. The system is running the latest version of Debian in a minimal installation. In my last post, about this topic I installed Postfix and Scalix on the same host. This time, I will install Scalix on a host and Postfix for […]
In this post, I would like to show, how to create a new VM with Proxmox by using the web based wizard. Before you can start you should have installed Proxmox on the host and configured the networking respectively. You can find my how to here: How To: Install Proxmox on Debian Wheezy How To: […]
This time, I would like to show how proxmox networking configuration can be configured. In my last post, I showed, how to install proxmox and get ready to create VM’s. I will show a typical configuration, which I always use. The official documentation can be found here: Proxmox Network Model I will show, how to configure […]
In this post I would like to show how to install proxmox on debian Wheezy. Proxmox is a web-based GUI for KVM. I use this in my LAB for all the software related testing. It is free, but you can also get commercial support. It is one of those great open source tools. Check Requirements […]
This post will describe, how to use a reverse ssh tunnel to backup an external device, like a server to your Synology DS via rsync. I have to use the reverse SSH tunnel function, as my DS is behind my firewall at home and my server (which should use the DS for backup) is in […]
This post will describe how to enable SSH and rsync on a Synology DS. This will allow you to use your DS as a backup server. For this post, I use the Synology DS412+ with the latest version of DSM 5.1-5004. Enable SSH and Rsync Before I start, I would like to explain the environment, in […]
This time I would like to show, how to secure the connection between postfix and the client with the help of a certificate by using postfix with TLS support. You can use your own certificate authority for that or a public one. I will use StartSSL to create my certificate and use postfix with TLS. […]
