usually this means the server is having problems. like the cpu is overloaded (too much mail or maybe some other process going haywire), a drive is full, an admin has blocked mail temporarily, etc. you might get these for a while. like it says, it will try to send the mail for up to 5 days... then give up. usually, someone will complain loud enough on the other end before 5 days goes by. heh
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