Martin pointed me at a rather handy set of scripts for generating the regex for spam assassin custom rules: CMOScript I haven't had any success with the custom rule I was trying to generate, but that's more likely due to me than the scripts :) … [Read more...] about Spam Assassin Custom rules generation
Spam Filtering
PayPal phishing attacks
We seem to get one or two of these emails a week, possibly more. They are usually very well crafted and unless you actually read (and understand) mail headers it is easy to see how someone could be duped by them. The one we got this morning is below: It looks and feels like a genuine Paypal email, until you look at the headers or the HTML source. The scammers have, of course, … [Read more...] about PayPal phishing attacks
SA version check
Julian gave a nice little snippet of perl to check the version of SA from the command line: perl -MMail::SpamAssassin -e 'print $Mail::SpamAssassin::VERSION;' Thanks Julian! … [Read more...] about SA version check
Bad Anti-spam measures
I am getting really tired of other people's anti-spam measures. I got the following from a mail server this morning (sanitised to protect the innocent): The address to which the message has not yet been delivered is: xx@xxxx.com Delay reason: SMTP error from remote mailer after RCPT TO:: host mail.xxxxx.com xx.xxx.xxx.xxx]: 451-Thank you for emailing xxx, due to our Anti-Spam … [Read more...] about Bad Anti-spam measures
DNSBLs in Postfix
A few weeks ago I started doing some work on geo specific filtering, where email is treated very differently depending on the sending IP. Since implementing this we have been very happy with the results. I also run a UML for my personal usage and for a couple of my pet projects. It's a nice place to try things out. Needless to say the domains hosted on it do get sent a lot of … [Read more...] about DNSBLs in Postfix