Tag Archives: backscatter

When I meet a new customer to discuss their spam problems I often hear of the same complaint. “We are getting spam from postmaster addresses and we don’t know why.” This complaint has a multitude of variations but we tend …

My last post on international spam fighting attracted a comment from reader Andreas Kroll.  Andreas asks “Why is it really so hard to tackle spam?” That is a good question, and one we don’t often stop and think about.  The …

This is a real case study, which happened over the last couple of weeks at a client site. During this time the client email administration team had been experiencing various problems with their LISTSERV.  First, let’s cover a few technical …

Most of the articles you’ll read on a blog such as this will describe how to protect yourself from certain types of spam.  Most of the articles I’ve written so far do exactly that.  Today I’m going to add another …

GFI has released a white paper examining NDR spam. NDRs (Non Delivery Reports) are simply the “bounce back” message a sender gets when their email is rejected by the recipient’s mail server. This usually happens if the address is invalid …

According to Slashdot, Google’s mail servers appear to be responsible for sending large amounts of backscatter. They don’t perform any recipient validation for the googlegroups and blogger.com domains (and presumably their other domains as well), allowing spammers to launch large-scale …