A lot of the junk mail my server rejects (usually because of no RDNS) gets
stuck in the sendmail queue, so I flush it with a cron job every night.
However I've noticed that spam being sent via my backup mx is getting
permanently stuck, i.e. it isn't getting deleted if it isn't delivered
within n days. Is this a backup-mx-being-used-in-a-naughty-way specific
thing, or a misconfiguration?
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