>> that those servers send me ham but also spam

> Purely IP based - checks do not make sense for IPs 
> which have  mixed (ham/spam) output per definition.
> This is als valid for the ISPIP list.
> So - many people run the nodelay list also as ispip list.

probably you missed the point about the "cluster" issue

let's say we have a "cluster" made up this way (the IPs/hosts 
below are for true, are used by Italian Interbusiness and 
TelecomItalia as mail "emission" points but this isn't the only
one around having such issues with delaying)

#
# alice and interbusiness
#
85.33.2.6   # smtp-out02.alice.it
85.33.2.7   # smtp-out08.alice.it
85.33.2.8   # smtp-out09.alice.it
85.33.2.12  # smtp-out01.alice.it
85.33.2.13  # smtp-out05.alice.it
85.33.2.14  # smtp-out06.alice.it
85.33.2.15  # smtp-out07.alice.it
85.33.2.16  # smtp-out10.alice.it
85.33.2.17  # smtp-out11.alice.it
85.33.2.18  # smtp-out13.alice.it
85.33.2.19  # smtp-out19.alice.it
85.33.2.20  # smtp-out20.alice.it
85.33.2.21  # smtp-out21.alice.it
85.33.2.22  # smtp-out22.alice.it
85.33.2.23  # smtp-out23.alice.it
85.33.2.24  # smtp-out24.alice.it
85.33.2.25  # smtp-out25.alice.it
85.33.2.26  # smtp-out26.alice.it
85.33.2.27  # smtp-out27.alice.it
85.33.2.28  # smtp-out28.alice.it
85.33.2.29  # smtp-out29.alice.it
85.33.2.30  # smtp-out30.alice.it
85.33.2.31  # smtp-out31.alice.it
85.33.2.51  # iptvwm.rossoalice.virgilio.it
85.33.2.53  # smtp.aliceposta.it
85.33.2.55  # out.aliceposta.it
85.33.2.56  # in.aliceposta.it
85.33.2.57  # mail.rossoalice.virgilio.it
85.33.2.58  # gmail.rossoalice.virgilio.it
85.33.2.59  # pushsrv.attiva.biz
85.33.2.128 # MTA128A.interbusiness.it
85.33.2.129 # MTA129A.interbusiness.it
85.33.2.130 # MTA130A.interbusiness.it
85.33.2.131 # MTA131A.interbusiness.it
85.33.2.132 # MTA132B.interbusiness.it
85.33.2.133 # MTA133B.interbusiness.it
85.33.2.134 # MTA134B.interbusiness.it
85.33.2.135 # MTA135B.interbusiness.it
85.33.2.136 # MTA136C.interbusiness.it
85.33.2.137 # MTA137C.interbusiness.it
85.33.2.138 # MTA138C.interbusiness.it
85.33.2.139 # MTA139C.interbusiness.it
85.33.2.140 # MTA140D.interbusiness.it
85.33.2.141 # MTA141D.interbusiness.it
85.33.2.142 # MTA142D.interbusiness.it
85.33.2.143 # MTA143D.interbusiness.it
85.33.3.5   # smtp-OUT05A.alice.it
85.33.31.84 # smtpout084B.attiva.biz
85.33.31.85 # smtpout085B.attiva.biz
85.33.31.86 # smtpout086B.attiva.biz
85.33.31.87 # smtpout087B.attiva.biz
85.33.31.88 # smtpout088B.attiva.biz
85.33.31.89 # smtpout089B.attiva.biz
85.33.31.90 # smtpout090B.attiva.biz
85.33.31.91 # smtpout091B.attiva.biz
85.33.31.92 # smtpout092B.attiva.biz
85.33.31.93 # smtpout093B.attiva.biz
85.33.31.94 # smtpout094B.attiva.biz

now, someone sends to my ASSP an email through those
servers, a first server, from a given IP (they may be behind
a load balancer for example) tries to send the email, my
ASSP delays it and sends out a 4xx; after a while, the sender
cluster retries, but this time the connection comes from another
IP from the "cluster" so it's delayed again... and so on, and in
many cases this causes the mail to be refused (over attempt
limit) so, in such cases we'll need to skip the delay for those
IPs but NOT to skip the regular spamchecks for it nor to lower
the score and consider it "better" than it is :)



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