Chris, > Watch out for mail services that forward e-mail to your > users. Think this: > A user has an MSN account that gets a lot of spam, and > that user sets his MSN account to forward to his local > mailbox. Blam! You no longer receive _any_ email from MSN.
Accepted - that's why I'd only want to use this approach to target persistent and readily identifiable spammers. By blocking using this technique, you'd be accepting that any matching system would effectively cease to exist as far as you are concerned. The problem I'm trying to address is where your system is flooded by messages from addresses which belong to spammers, and despite greylisting and MD/SA scoring it as 20+ and sending a 500/571 permanent error, they keep trying at the same rate. At the moment, it is an annoying background trickle, but I can see a tidal wave in the distance because for every site which does sensible blocking, there are 100 more who will accept the message, and so it is never worthwhile for them to edit their lists to remove the addresses which fail. Some would argue that returning a permanent error for spam is incorrect, but that's my policy, it works for me, and it has the support of the directors here. If I can cut my bandwidth usage by 5% and reduce the load on my MD/SA system by eradicating the garbage from this one company, the effort will be worth it. Best Wishes, Paul. __________________________________________________ Paul Murphy Head of Informatics Ionix Pharmaceuticals Ltd 418 Science Park, Cambridge, CB4 0PA Tel. 01223 433741 Fax. 01223 433788 _______________________________________________________________________ DISCLAIMER: This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to which they are addressed. If you have received this email in error please contact the sender or the Ionix IT Helpdesk on +44 (0) 1223 433741 _______________________________________________________________________
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