Receiver (To/CC envelope fields) addresses verification against LDAP/Active Directory in sendmail

Warren Block wblock at
Sat Apr 7 17:37:22 UTC 2007

On Sat, 7 Apr 2007, Christopher Martin wrote:
> I guess I could white-list out all of sales' and senior management's
> addresses.

The scenario where sales and senior management get all their spam with 
no delay and everyone else gets the benefit of greylisting sounds pretty 
much ideal.

Incidentally, my experiments with varying the greylisting timeout period 
have shown no appreciable difference.  It's the initial refusal that 
does the most good; spam zombies generally can't afford the time to 
retry.  I have seen a few where there's a quick attempt to resend the 
same spam from up to about five different spam zombies, but greylisting 
handles that very effectively.

-Warren Block * Rapid City, South Dakota USA

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