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On Thu, 2015-06-25 at 13:25 -0700, Brandon Long wrote:
> We haven't implemented it yet, though we expect to in the near future.

Does this mean that google will then refuse to deliver mail to sites
that:

1) advertise starttls in response to ehlo, and
2) have a 512 bit DH key?

That seems to be implied by "we (google) stopped falling back to
unencrypted connections..."

In this, as in so much else in life, the behavior of the giants (google,
microsoft, etc) will determine what is acceptable regarding delivery to
such sites.

If we need to automatically fall back to an unencrypted connection
(ignoring the starttls offer from the server), users of sendmail will
need to script something to automatically add entries to their access
file. The current sendmail does not have any built-in support for such a
fallback.

If google will refuse to deliver mail to such sites, that will remove
any pressure on sendmail and its users to implement such an automatic
fall back scheme. The burden is then entirely on those old receivers to
upgrade their DH keys. This is the outcome that I would prefer.


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