On Sat, 12 Dec 2015, Viktor Dukhovni wrote:

And SMTP has the big advantage, that you can define the name of the host in
MX, so the name of the mail server can be independent from the domain of the
email address.

Simply wait a bit longer and maybe that issue solves itself :-)

Thanks for the moral support.  I agree that SNI is not particularly
compelling for port 25.  The more strongest arguments for SNI that
I've seen are for port 587 submission, where there's no MX indirection,
users' MUAs have statically configured SMTP servers.

At least for Thunderbird and some open source mail software I got rid of this issue as well by implementing the autoconfig procedure:
https://wiki.mozilla.org/Thunderbird:Autoconfiguration:ConfigFileFormat
That's much more powerful than SNI alone. Parsing the postfix files it gives each of my users the correct settings for all of their email addresses.

Negative: If fully implemented it allows everybody to find the username for a given mail address but I decided that's worth the additional comfort. Usually guessing gives you the username not much slower (with some uncertainity).

I tried also to implement the Microsoft variant but till now I do not think setup is really correct. :-)

Ciao
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