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OT? /dev/null 5.1.1 email
<disclaimer> I know this is an email-only question, however the value of the feedback from NANOG is greater than elsewhere, imho. </disclaimer> Should undeliverable email (5.1.1, User unknown) be directed to /dev/null rather than responded to? I was always under the impression that it was nice to respond with a polite message, however these days it seems that 95% of the polite responses are going to 5.1.1 addresses themselves. Tia, -Jim P.