[exim] Limiting incoming messages per connection

Hi!

Maybe this can be a stupid question :) , but I don't know how to limit
the number of incoming messages my mail servers can accept per connection.

Actually I know there's no limit, and I want to set it low to avoid some
kind of situations in my installation.

Can you tell me what is the option to do it ? (exim 3 and 4)

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    Thanks in advance,

        Manuel Molina Cuberos
        ya.com Internet Factory
        91 141 7931