On Wed, 14 Sep 2005 11:11:01 CDT, wayne said:
Life is not so easy for spammers that they can just send all their
email twice. Graylisting, and the like, require you to send the email
from basically the same IP address/block and use a consistent domain
name and such. After a few hours, other anti-spam tools such as
DNSBLs, RHSBLs, DCC/Pyzor/Razor, etc. have had a chance to react.
Note that all these tools make the assumption that *some* people *aren't*
greylisting - some spam has to get through to prime the DNSBL or DCC/whatever.
If greylisting were near-universal, not enough would get through the first
time to set a trigger for the next time.
Just something to keep in mind... ;)
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