[exim] bounce messages and their potential misuse

Hi all,

I hope this isn't bad form posting these links on the list, but I think
some of you may genuinely find this useful.

It poses some interesting questions about joe-job bounce messages and
their potential misuse to evade _some_ types of spam filters.

The article is here:
http://www.theregister.co.uk/2006/03/30/joe_job_twist/

This history of the joe-job can be found here:
http://en.wikipedia.org/wiki/Joe-job

Thanks
Jason Meers