> Michael Scheidell wrote: >> i get NO backscatter here. >> case study for one of our clients, they got 50,000 spams a month >> (normally). they got joe jobbed. they started to get 5MM a month. >> (with no increase in backscatter reaching users. In fact, the client >> never knew.. until the next month when his DNS provider hit him with a >> huge overage bill for excessive DNS queries of his MX record.) >> >> its mostly stopped by the vbounce rules, (we set the score to 10). but >> you have to keep up with sending servers, servers at partners who send >> on your behalf, etc.
On 14.04.10 16:16, Kris Deugau wrote: > ... In other words, keep track of all of the third-party hosting systems > our customers insist on forwarding their domain mail to their ISP > account (ie, us) from? > > Not practical. requiring your users to send mail through your mailservers when the From: is in your domains is the basic rule of blocking backscatter and implementing anti-forging techniques as SPF and/or DKIM. I'm afraid you just must do it (or maintain the lists) if you want to do something against this kind of problems. -- Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/ Warning: I wish NOT to receive e-mail advertising to this address. Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu. Nothing is fool-proof to a talented fool.
