My mailserver got some nice features to fight spam. One of them is the well known filter SpamAssassin, being the last line of defense here. In theory, a nifty setup, if you kill quite some spam and leave the rest to SpamAssassin. But trust me, if SpamAssassin doesn’t get enough spam, it literally starves due to the lack […]
Tag: mail
Killing Spam
Let’s have a look at one of my favorite topics today: E-Mail Spamfilters. They are a quite helpful tool for keeping the inbox clean as long as you don’t fully trust their work. I know this sounds paradox, but what happens if they eat a message you wanted to keep? What if they don’t kill a spam mail […]
Untrained Spamfilter Blues
I migrated my mailserver a few hours ago to a complete new system to have a better groupware solution and less noise. But honestly, I am already missing the old patchwork system as its spamfilter was working very very very… efficient. As the new anti spam system didn’t have that much training, the detection rate is simply crap. […]
Let’s get active
Today is a wonderful day, the Linux Day in Dornbirn – the place to gather my CAcert points to become an active assurer for the Web of Trust. As it was possible to take the assurer test on site – god bless the inventor of wireless lan – I could start to assure people immediately and gain the […]
Now with new Certificates
It shouldn’t be a new topic to secure your data while sending it across public lines like the internet. This usually happens using server certificates, which are made once and never touched again – if self signed. In my case I wanted to do it better and got me a certificate from CACert.org. At least it is a […]
Is it me John Wayne, is it you?
Some spammers can really drive you mad – especially if they are doing things like that. Looking at my mailserver logs I have found some strange IP addresses like 123.27.3.81, 222.252.80.188 or 123.16.13.188 which are resolving to ‘localhost’ regarding to their reverse DNS. In other words, a bad configured mailserver thinks that the mail comes from itself and […]