>> The lesson is that I should have been more cautious. Probably that
>> process would be best handled by a group of people.
>
> We must keep in mind that email is no longer reliable, given the
> widespread use of aggressive and heuristic spam filtering today.
Yeah. :-/
Well, in this case I would have expected an explicit ack from us: I
replied to all the emails confirming that the relevant proposals were
accepted in melange, also to prevent typos (like listing the wrong
proposal) from the mentors.