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I have an account level filter for any address that contains, for example, -bounces@domain.tld so that mail sent to auniqueid-bounces@domain.tld can be piped to a newsletter management script. Testing the address using the Filter Trace on cPanel shows that it sets up a significant delivery, as expected.

The problem is that, when other scripts send mail to using the bounce address as the sender, the mail is never delivered. I get this error report from the Email Trace on cPanel:

Event:  rejected rejected
User:   -remote-
Sender: auniqueid-bounces@domain
Sent Time:  Oct 12, 2012 5:16:17 PM
Sender Host:    our-isps-mail-server.tld
Sender IP:  x.x.x.x
Authentication: unauthorized
Spam Score: 
Recipient:  realaddress@domain.tld
Delivery User:  #######
Delivery Domain:    domain.tld
Delivered To:   
Router: reject
Transport:  **rejected**
Out Time:   Oct 12, 2012 5:16:17 PM
ID: ###########
Delivery Host:  our-isps-mail-server.tld
Delivery IP:    x.x.x.x
Size:   0 bytes
Result: Sender verify failed

I don't know what to do to get the bounce addresses (which must unique per message to prevent abuse) to be recognised as valid.

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