[Uta] MTA STS and HTTPS fetch timeouts

[Daniel Margolis <[e-mail]>]

There was some discussion of this at IETF96: Should we be specifying
timeouts on the HTTPS GET during policy fetch?

I was looking at RFC 2821's timeouts for comparison (section 4.5.3.2):

"Based on extensive experience with busy mail-relay hosts, the minimum
per-command timeout values SHOULD be as follows..."

The initial 220 timeout is recommended to be 5 minutes. But then I took a
look at qmail and postfix, and if I am reading the docs correctly their
default timeouts on connect are 60 and 30 seconds respectively.

So this sort of makes me think that we should not bother to suggest
specific timeouts in the RFC, as I am not sure how useful they will be.
(Now, granted, the world has changed since RFC 2821 was written; it's
hardly a sign of failure if 15 years later your timeouts aren't quite the
norm!)

Any contrary opinions on this? And if so, any specific thoughts on what
those timeouts should be?

Dan