Am 10.02.2018 um 05:11 schrieb John Levine:
But to answer your question, off-hand, I'd say that any TTL under 60s is =
suspicious and any TTL under 10s is almost certainly intentionally =
abusive.
I hope you're not planning to do much spam filtering
i do for years with a min-ttl of 90 secods and you will have a hard-time
to beat our results - using a mix of many DNSBL/DNSWL on postsrceen as
well as SpamAssasin does the trick and not ordianry low TTL's
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