On 15/04/2020 23:16, Emilio Augusto Lazo Zaia via Exim-users wrote:
> I would like to queue all messages to be delivered through a smarthost based 
> upon some criteria, for instance the number of messages the smarthost can 
> transport without blocking us for security reasons.
> 
> Some user in the domain sent thousand of mails in a short period of time and 
> these mails bounced back by the smarthost

Actually rate-limiting a outbound flow is quite difficult.
There are some possible approaches discussed on one of the wiki
pages, I think.

However, for your case, it would be far simpler to ratelimit
the inbound flow, per-sender.  There's an ACL condition to
to that (with appropriate choice of parameters).
-- 
Cheers,
  Jeremy

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