This happened with Exim 3.22 so it may not be interesting anymore.
We have MAILER-DAEMON aliased to /dev/null (in /etc/aliases)
and we *had* a director like this:
system_aliases:
driver = aliasfile
file = /etc/aliases
search_type = lsearch
# user = exim
# file_transport = address_file
# pipe_transport = address_pipe
N.B. file_transport *was* commented out
result - all attempts to deliver to Mailer-Daemon crashed.
Fixed now, but of course, "Exim should never crash."
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