[exim] Load Based Grey Listing

Here's something I'm testing out - greylisting based on server load levels:

defer log_message = DEFER - Host $sender_host_address - reverse lookup 
failed! Load: $load_average
      !verify = reverse_host_lookup
      condition = ${if >{$load_average}{25000}{true}{false}}

$load_average = 1000 x real load so - 25000 = load of 25


The idea here being that under high load I put off senders that are
mostly spammers till the load level drops.

--
Marc Perkel - marc@???

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