[rt-users] RT thinks this message may be a bounce...?

[spydrrrrr at gmail.com]

Fedora Core 4 and RT 3.4.2

I am getting more of these recently...

What is the best way to troubleshoot why? The emails still seem to get
to and from RT but the root user on the server gets this message with
the original message attached

RT thinks this message may be a bounce
...

Where should I look for a root cause? Do I need to worry? Can I
disable this feature?

Thanks.