I assume processing incoming emails is a tangible feature SendGrid wins on

You could receive at SendGrid and send at SES to save money.

Given that Google has not even existed as long as Steve Jobs has in this second coming, there is no reason to think they can do anything consistently ever ... or learn from their mistakes in they way Apple has done better than the great majority of companies.

You could apply your negative reasoning to most tech companies in this new Dot Com Bubble.

Fact is, Apple has been through positive learning curves.

You Americans are crazy. Look at the rest of the western world, and how common it is for public health insurance, and how it is a good thing generally.

Out of all your issues, you pick this one to be stupidly paranoid about.

What is meant by "target" sites?

Do you mean a site that uses a third party authentication?

If we need every website out there to code security checks for these third party systems, I doubt we can rely on that

So how do these third party authentication systems protect against this pretty straightforward javascript way of circumventing the authentication? Anyone know?