[I changed the subject because this is not a continuation of the part of 
the thread that was getting acrimonious]

Jeremy Harris wrote:
> 
> Without knowing for sure what mails are spam and what are ham,
> we reject connections:
>    10% rdns + 2mx
>    35% helo
>    5%  dnsbl
>    20% conn-dropped during delays
>    10% no such user
>    3%  sender-verify

I'm curious -- what's that first criteria "rdns + 2mx"? Do you require 
any sending site to have at least 2 mx's configured?

I used to have a backup mx configured for my site, but I disabled it 
long ago as it turned out to be more hassle dealing with the spam 
injected through it than it was helpful in dealing with lost mail during 
outages of the primary.

- Marc

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