We run exim relaying mail for our customers, as a virtual ISP.  These 
customers generally use SMTP AUTH, although some do use squirrelmail.

I know that exim can control the incoming rate quite easily, but we would like 
to rate limit the *outgoing* RCPT TO: rate per authentication source when 
processing the queue, without limiting the incoming mail rate.  

If a customer exceeds their set limit, we can then notice that the queue is 
building up and ...
 * do nothing (we don't care)
 * allow a higher rate (we love and trust them, and they pay for it)
 * enforce incoming rate limit for that customer (we think they are being 
stupid)
 * kill their account (they are being evil)

How can exim be configured to rate-limit outgoing mail?

&:-)

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