On 1/23/2007 4:00 PM, Peter J. Holzer wrote:
Pushing all the filtering to the end-user would make that much
not the filtering, just the filter configuration. MTA-resident complex
content filtering with different per-recipient outcomes is not compatible
with recipient enumeration preceding the data block;
It can still be done. It just needs a bit of trickery with 4xx replies.
It's ugly as hell, and it increases mail traffic (and CPU usage for
filtering), but it works.
see http://www.ehsco.com/misc/I-Ds/draft-hall-inline-dsn-01.txt which uses
per-recipient codes after the data block (the LMTP model)
It's not likely that spammers would use it however
Eric A. Hall http://www.ehsco.com/
Internet Core Protocols http://www.oreilly.com/catalog/coreprot/
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