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.

On 09.02.18 23:11, John Levine wrote:
I hope you're not planning to do much spam filtering.

do you have any evidence where enforcing a 5s minumum leads to serious
problems?
--
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