[ntp:questions] Re: Good GPS for attic?

Brad Knowles brad at stop.mail-abuse.org
Thu Feb 17 01:20:01 UTC 2005

At 8:16 PM +0000 2005-02-16, Gary S. wrote:

>  Quite a bit of spam, and very little "real" email, has a system clock
>  time way off from reality. If you account properly for the time zones
>  and delivery delays, this might be another sort of spam filter.

	Actually, I see quite a bit of "real" e-mail that has a 
screwed-up clock.  Most PCs don't run NTP or anything else to keep 
their clocks in good sync, and PC hardware is very well known for 
frequently having some very screwy clocks.  More than a few PCs have 
bad BIOS batteries, so if they ever reboot then their clocks are well 
and truly screwed.

	This might be one more factor to consider in a greylisting 
scheme, but I wouldn't go beyond that.

Brad Knowles, <brad at stop.mail-abuse.org>

"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."

     -- Benjamin Franklin (1706-1790), reply of the Pennsylvania
     Assembly to the Governor, November 11, 1755

   SAGE member since 1995.  See <http://www.sage.org/> for more info.

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