On Mon, May 04, 2015 at 06:01:07PM -0700, Paul Hoffman wrote:

> In Section 13, there is no justification for why TLSA records for HTTP
> servers should have a TTL an order of magnitude shorter than those for
> SMTP servers, and I can't think of one. Proposal: suggest all TLSA records
> have a TTL of an hour.

Without necessarily disagreeing, the rationale was:

    * MTA to MTA SMTP is non-interactive store and forward, and
      moderately high latency (mail queueing until the problem is
      fixed) is tolerable, if sufficiently rare.

    * HTTP servers provide generally interactive services, where
      users might be less forgiving of a 1 hour outage.

Perhaps the right answer is to not suggest any particular TTL, but
just note the issue, leaving the choice of TTL to the reader...

-- 
        Viktor.

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