On Tue, 1 Aug 2006, Ramprasad wrote: > How about sending "450 Please Try later" to ever mail with an > inline image and then somehow verify if it really comes back. > (Obviously not my original idea :-) )
The problem there, again, is that you've already used the bandwidth and system resources needed to receive and scan the message. Why explicitly say "please re-send the message later, I'd like to use my bandwidth and CPU resources to process it again"? Would the benefit outweigh the cost? Then add in the infrastructure and long-term resources needed to determine whether you've seen the message before and make a decision based on that data. > How many spams would really comeback. max 20% There is a much lighter-weight and more global way to achieve that: standard greylisting. If some spammer MTAs are going to only try delivery once, why expend heavy resources on your end (a full SA scan) to decide whether to TMPFAIL the message just to see if they do? Just install milter-greylist and lose *all* of the lazy-spammer traffic regardless of whether or not it is multi-image-only format. -- John Hardin KA7OHZ ICQ#15735746 http://www.impsec.org/~jhardin/ [EMAIL PROTECTED] FALaholic #11174 pgpk -a [EMAIL PROTECTED] key: 0xB8732E79 - 2D8C 34F4 6411 F507 136C AF76 D822 E6E6 B873 2E79 ----------------------------------------------------------------------- It may be possible to start a programme of weapon registration as a first step towards the physical collection phase. ... Assurances must be provided, and met, that the process of registration will not lead to immediate weapons seizures by security forces. -- the UN, who "doesn't want to confiscate guns" -----------------------------------------------------------------------
