On 2016-06-30, John McMurray <john@???> wrote: > Hi all,
>
> I've been seeing an increasing amount of spam arriving as bounce
> messages. I'm not sure at all if this is some clever trick to send spam
> in a bounce format, or if its actual bounces that was sent somewhere
> else with our email addresses as the sender.
>
> Below is an example. Is there anything I can do to prevent my users from
> getting these? I've searched as much as I can but I don't seem to see
> anything useful for this type of case. I might just be looking in the
> wrong places (search terms).
use an RBL or three..
backscatterer.org is specific to this type of spam.
sorbs and spamhaus are worth a look too.
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