RW wrote:

quoted text
>

> What I was getting looked like backscatter and smelled like backscatter

> it is just that some of the IPs sending it didn't check out as MTAs.

> i.e. they were not listed MXs for the domain they came from AND the

> domain was not likely someone with separate outbound senders.

>

> They all retried too and when I had them as TRAPPED entries the logged

> data included typical failed-to-deliver messages.

> 

'bots getting smart eh? Bugger! If that is the trend, greylisting starts

to lose its value as spammers adapt to the RFCs.
Set up a pf queue of dialup speed for windows boxes connecting to port

25? Should slow them down a bit, but still let the odd legit extrange

sent mail in.