I've just been looking through my mail logs to assess the effectiveness 
of the RBLs, and I see things like the following:

courieresmtpd: 
error,relay=::ffff:88.236.181.253,from=<[EMAIL PROTECTED]>,to=<[EMAIL 
PROTECTED]>: 
511 http://www.spamhaus.org/query/bl?ip=88.236.181.253

Since it has the from and to addresses listed, that implies that the RBL 
was consulted after the MAIL FROM and RCPT TO commands were sent. Is 
this not wrong? I would have thought that in the interest of wasting 
fewer resources on spammers, RBL should be checked sooner. Possibly even 
before the server responds with the initial 220. Was this deemed 
necessary in order to get a head start with legitimate mail while the 
RBL was being queried in the background? Is there a way to change this 
behaviour via configuration, or is it hard-coded?

Gordan

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