On Fri, Sep 15, 2017 at 08:14:40PM +0000, Binu Ramakrishnan wrote:

> One advantage of using a sub-domain is the ability to delegate STS policy
> serving (and mail hosting) to a 3rd party service provider.

If support for 302 redirects is added, perhaps that case becomes
less compelling?  

Though the redirect to the provider would have to be done by whatever
serves "example.com", rather than "mta-sts.example.com", and it
may in some cases be more difficult to get the redirect to happen
there, so having a subdomain makes it a bit easier to do the job
with a CNAME, if the provider can obtain the requisite certificate.

-- 
        Viktor.

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