On Oct 24, 2017, at 3:54 PM, Brandon Long <bl...@google.com> wrote:
> Google's MTA's send SNI, and we have used it for inbound smtp to provide
> white label support for large GSuite customers. It was more important for
> MSA, but these customers all wanted that level of control at the MX level as
> well.
Thanks for that. That's exactly the kind of information this
discussion needed. The MSA case is indeed the more compelling
one, but it seems that some customers want this for MX too, and
once they've paid the logistical price of making SNI work for
submission, they sometimes choose to also employ vanity/white-label
MX hosts while they're at it.
In that case, SNI language à la RFC7672 section 8.1 might do the
trick. If you like that enough, a reference to that might save
you the need to repeat the same text.
--
Viktor.
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