Simulations will also help you recover as quickly as possible from disasters, since you would have done it many times before, and you know what’s coming next and what to expect at every step. This will ensure that if you ever need to restore from your backups, you will be able to, and not discover that the backups are useless, on your life’s worst day! Disaster recovery simulations every so often on dummy servers are a MUST. You are saving money on licenses for your mail server, make sure you invest in a good and reliable backup system, and have a disaster recovery plan in place. What I mean to say is, Open Source is a great thing, as is the community behind it, but you need to prepare yourself for the worst.

Of course there are forums, and communities, but when you have a 300+ user mail server, who just refuses to boot up after a power failure, or just won’t work for no apparent reason, you won’t have time (or will power) to go lookup the forums and ask questions while patiently waiting for replies, which will perhaps never materialise anyway, or if and when they do, they could make you dig an even deeper hole than the one you are already in. Running an open source (free) mail server for a business can save you a LOT of money in license fees etc, however it also means that when the brown stuff hits the fan you are alone. Most of the time I will not go into what they output, I assume you are familiar with these, and if you are not, I suggest you become familiar before venturing any further. The commands highlighted in the black boxes, are the commands you need to run. It also assumes you are familiar with the Linux command line. Before we even begin, this blog post assumes the reader has basic understanding of Linux, TCP/IP, DNS, and how email in general works.

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