Thanks to all for all the thought that went into your replies. As I read 
them the consensus of opinion is that, "Yes, the string implying the 
sender is a spammer could show up in the headers of a bounced message 
from a legitimate sender."

I'm going to change that string in the spamd code in my tree; I can't 
afford to falsely accuse someone of spamming me.

Thanks!
Jay

On Sun, Mar 11, 2007 at 03:43:03AM +0100, the unit calling itself Peter N. M. 
Hansteen wrote:
> Darrin Chandler <[EMAIL PROTECTED]> writes:
> 
> > I suspect I'm not the only person who's had the spamd messages come back
> > from someone who's message didn't come through. While in "normal"
> > circumstances these messages don't show, there are enough email
> > providers out there (large, commonly used ones) that retry a given email
> > in a round-robin fashion through a pool of outgoing servers. Since that
> > won't ever whitelist they get the usual 4 hour warning, and later the
> > bounce.
> 
> That does happen in cases where the retries for a message come from a
> different IP address than the original delivery attempt.  It had
> slipped my mind (it's been a while since I had it happen), but as you
> are correctly pointing out there are some sites which are problematic
> for that reason.  For some reason Gmail appears to be a special case -
> they appear to have their outgoing severs spread thinly over several
> address ranges, but they tend to get through anyway.  Then again, it's
> likely you end up whitelisting the affected networks once you identify
> them.

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