[exim] too many connections

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Author: Michael Connors
To: exim-users
Subject: [exim] too many connections
I have an exim mail server with the max number of connections set to 150.
It has been running fine but over the last week or so, I am getting
large numbers of established smtp connections to my machine even when
the mail queue is completely clear.
Because of this I am ending up dropping connections. I would rather not
increase the limit because that real problem is the large number of
connections and not the current limit.

Could this be some sort of attempted dos attack?