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There are tons of article out there stating different things, being obsolete and handling single domain servers (are there any of those left?) when it comes to DKIM mail signing and verification with amavisd-new and Postfix. So this is what I found out to be true and woring after puzzling together bits and pieces of those articles and howtos.

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Greylisting is a great method to prevent a lot of spam coming from hacked PC's or other systems not meant to send emails. Greylisting works by first returning a 450 status to the sending server which basically says "I'm unable to handle your email right now, pleaase try again". Since most non-RFC compliant servers won't retry sending the email but correct configured email servers will try again you have prevented spam delivery, yay!

Do like this on Ubuntu:

 

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If you have ever tried to run your sites through a proxy or Varnish with ISPConfig3 you have probably encountered the problem that whenever you make a change to your site settings through ISPConfig3 web gui, the default port 80 will be written to your vhost file, overwriting any custom port you have there. The solution to this is, according to the developers in their forum, to make a change in:

/usr/local/ispconfig/server/conf/vhost.conf.master

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I want to keep my media server on for as little time as possible while at the same time I don't want to manually turn it on every time I want to use it. Turning it on right before I reach home after work is no big deal most of the time, I can also easily turn it on with a wakeonlan call from my phone, turning it off however was more of a problem as I don't know how late I'm going to stay up to watch a film or TV series. I stream all the media from the server over DLNA to both my TV, my PC and my phone.

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Fix suhosin configuration for Roundcube webmail:

/etc/php5/apache2/conf.d/suhosin.ini:

suhosin.session.encrypt = off