[exim] reactive filtering to log files with exim possible?

Can Exim be configured to react to log files?

There is talk out there in the internet about other MTAs like Port25
which has the ability to react in real time to log files such that if a
log entry contains a Yahoo 421 message, either switch IPs or otherwise
shut down the queue.

This sounds like a great idea and I'm wondering if Exim has the muscle
to do this?

thanks.