I think, if TE doesn't want to give emails to sponsors, he should sell them. They could be $20/year or $25 permanent, or 30m/year /35m permanent RSGP. That would be pretty reasonable. Because, they are just emails in the end. No one could pose as staff, as there is clearly a view-team list.
And, maybe Sponsors/Elites could get a small discount?
Elites - $15/year, $20 permanent - 25m/year or 30m permanent RSGP
Sponsors - $10/year, $15 permanent - 20m/year or 25m permanent RSGP
It all depends on what TE wants to do, but I quite like this idea. He can earn a bit more money, and they can still be quite unique.
Or, even better, make them only available to be bought by Elites and/or sponsors?