Well, try to write a program to recognize this (easy) and extract the right address to delete. Then run your program on a couple hundred sample delivery errors from various sources and see how many times it deletes the wrong user, or nobody at all. Then see how often it deleted a user for a temporary error. LISTSERV only processes formatted delivery error reports like those generated by LMail, PMDF V4.2 and MX V3.2 and above. With these reports both the address and the temporary/permanent nature of the error can be determined safely. Eric