>   - 3. The sending IP is using a broken mailer that's
>         generating bare LFs, and this mailer regards the
>         resulting temporary error code generated by qmail
>         as 'Please try again straightaway'.
> 
> I'd be particularly interested to know if anyone has come
> across the 3rd possibility...

Yup, I see it happen on occasion.  I usually sniff the message off the wire
to see if its anything I care about then toss a deny rule into my tcprules
for that ip to stop the hammering.  Sending the remote party a message is
nice too though I rarely get any cluefull responses.

-- 
Jamie Heilman                               http://wcug.wwu.edu/~jamie/
"We must be born with an intuition of mortality.  Before we know the words
 for it, before we know there are words, out we come bloodied and squalling
 with the knowledge that for all the compasses in the world, there's only
 direction, and time is its only measure."              -Rosencrantz

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