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Using greylisting alone will be soon almost unuseful.Maybe, but it's stopping a lot of junk for us :)
DNSBL too block a lot of spam. Which could be the difference of using greylisting and DNSBL returning code errors "450 Service temporary unavailable" ??.
xxx@localhost (reason: 450 Service temporarily unavailable; Client host [206.46.170.173] temporarily blocked using bl.spamcop.net - see http://www.spamcop.net/bl.shtml?206.46.170.173 It's a soft way to use DNSbl without collateral damage. Regards -- Jesús Sanz de las Heras RedIRIS
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