On 11-Mar-2009, at 05:13, Tim Lyth wrote:
> Alessandro Vesely wrote:
>> LuKreme wrote:
>>
>>> On my system, about 18-20% of the grey listed email eventually
>>> gets delivered. Of the 20% that gets delivered, about 50% of that
>>> is spamtagged by SpamAssassin. About 80-85% of the connections to
>>> the server are rejected outright (RBL, invalid hostname, etc),
>>> before greylisting has a chance at the message. If greylisting
>>> was in front of our RBL and header checks, it's percentages of
>>> ultimately rejected spam would be much higher.
>>>
>>
>> May I ask about whitelisting? Submitters, usual contacts and/or
>> known hosts can be whitelisted
>>
>> * from greylisting, to gain in immediateness, and
>> * from SA, to avoid false positives.
>>
>> Do you do that, either systematically or case by case?
There are certain large domains that you need to exempt from
greylisting for one reason or another. these domains are often in an
exceptions list that comes with whatever package you use. I use
postgrey and it lists things like:
# greylisting.org: Southwest Airlines (unique sender, no retry)
southwest.com
# greylisting.org: Yahoo Groups servers (no retry)
scd.yahoo.com
# greylisting.org: isp.belgacom.be (wierd retry pattern)
isp.belgacom.be
# greylisting.org: Ameritrade (no retry)
ameritradeinfo.com
# greylisting.org: Amazon.com (unique sender with letters)
amazon.com
etc etc
I do not whitelist anything other than these with the exception of my
admin email account.
I have no whitelist exceptions for Spam-Assassin at all. Spammy mail
that gets tagged needs to be learned.
--
Ah we're lonely, we're romantic / and the cider's laced with acid /
and the Holy Spirit's crying, Where's the beef? / And the moon
is swimming naked / and the summer night is fragrant /
with a mighty expectation of relief
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