-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi Stuart,
@21 May 2002, 17:09:37 +0100 Stuart Webb wrote in [EMAIL PROTECTED]">mid:[EMAIL PROTECTED] > Having read all the bumph and still being not much wiser, is this > possible and how do I go about it. Yes it's possible. But a lot of how effective this is depends on the amount of spam you get per download. I was asked this question privately recently and came up with a very detailed response. I don't use Selective Download filters myself, which are the filters that handle scanning of headers to eliminate mail on the server. You will have to export your entire address book to a text file and use that file as the source for matching addresses. Other than that, My maths says that the overhead of downloading the headers of the good messages twice makes the whole process fruitless. It depends on what the proportion of spam/good messages you actually receive. Look at it this way: with an average of around 1kb per header block, and 5kb per average message body (that's generous!) and a ratio of 10 to 1 (good to spam), with 100 messages you are downloading 90kb of additional headers (once = 100kb of headers to scan with the Selective download filters then twice = 90kb + message bodies for the ones deemed good to download) to exclude 55kb of spam! It is more economical to download everything and remove the spam using standard filtering, which *does* have a far simpler access to the address book. Break-even comes when 20% of all incoming mail is spam. Effective (considering the time overhead of the pre-download scanning) probably comes when you are hitting the 25% mark or back at 10% if you know that all spam has an average body size of 15kb. That's still a huge proportion and I know that, by using SpamCop, my good/spam ratio remains at about 2%. - -- Cheers -- .\\arck D. Pearlstone -- List moderator TB! v1.60m-14F4B4B2 on Windows 2000 5.0.2195 Service Pack 2 -----BEGIN PGP SIGNATURE----- Version: PGP 6.5.8ckt build 08 iQA/AwUBPOtwAjnkJKuSnc2gEQIPZwCggnCkYPfWJMuFM4Ouc6R70zi4+DwAoPsK kadTZ97BwaD6tTNUjtTbUyN3 =yMML -----END PGP SIGNATURE----- ________________________________________________________ Current Ver: 1.60m FAQ : http://faq.thebat.dutaint.com Unsubscribe: mailto:[EMAIL PROTECTED] Archives : http://tbudl.thebat.dutaint.com Moderators : mailto:[EMAIL PROTECTED] TBTech List: mailto:[EMAIL PROTECTED] Bug Reports: https://bt.ritlabs.com
