Autoreplies.

[David Woodhouse]

A reminder about autoreplies -- they must go to the reverse-path of the
mail which triggers them, and have an empty reverse-path of their own;
just like bounces. Anything else risks mail loops and is a denial of
service attack waiting to happen. And will be reported as such to your
network provider in the strongest possible terms.

Anyone receiving an autoreply to a post they make to the list, please
forward it (with headers intact) to me. If you like, you can also use
'whois' or 'traceroute' to find out who provides network service to the
offending machine, and report it to their abuse address with a request
that the dangerously misconfigured machine be immediately disconnected
until its owner fixes it.

See also http://www.exim.org/eximwiki/EximAutoReply

-- 
dwmw2