Advanced mail security - our experience with automated reputation sharing in communities and pre-queue deep threat analyzers

From out daily experience as Linux Mail Security Consultants, we see different groups of infrastructures like universities and government authorities getting similar spam and threats. We have implemented automated ways to share this information among these clusters. We will introduce the techniques used in our Rspamd implementations and we will point at some pitfalls that should be avoided. We also like to talk about our experience with pre-queue deep threat second stage security analysis like sandboxing.