Backscatter is a fact of life. 99% of the emails in my queues are undeliverable backscatter. 99% of my inbound email is backscatter (since my domain gets used for forging email headers on spam). I'm retiring older systems which just can't deal with the backscatter. It just isn't economically viable to try to fight it any more; life is too short.
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Unfortunately there are two other companies in between me and the users (not that I can really identify them with the junk I have to use here) so short of finding another job I'm stuck with the problem.
-- /\oo/\ / /()\ \ David Mackintosh | dave@xdroop.com
Have you considered changing your setup to reject emails in the smtp process if they do not have a valid rcpt to? i.e. a valid email address on your machine to accept them?
This will eliminate much of what you are experiencing...
- rh
-- Robert - Abba Communications Computer & Internet Services (509) 624-7159 - www.abbacomm.net