What software are you using? For example, are you using amavisd-new, clamav, spam-assassin ?
...And additionally, postscreen (with dnsbl !), perhaps sane-security (as part of clamav), fail2ban (to block repetiive unsuccessful connections) etc. ?
Use sa-learn too! Perhaps this is more an amavisd question rather than a postfix one! All the best, Nick On 15/3/2014 5:35 μμ, jason hirsh wrote:
I have been noting an big increase in spam that contains html and images One common feature is that these emails contain hidden text that only shows up when I look at the source I found samples of this at http://www.hoax-slayer.com/hidden-text-spam.html Right now I have been having some success by blocking a country , in the most common instance .eu, in the header checks but can’t think of a body check to catch this when it spread further I would appreciate any suggestions
