On: foo@bar.com

[kubanczyk]

> In practice, is there any difference?

RFC 6761 says that there is a difference when I actually resolve these names. The example.com, example.net, etc. will resolve normally to an existent IP. Moreover they resolve the same way on every DNS cache.

The xxx.test will resolve as non-existent by default, unless you configure your own DNS specifically for them.

[joveian → kubanczyk]

> unless you configure your own DNS specifically for them

or use horrible ISPs that redirect everything that isn't valid (and intercept DNS if you try to use an alternate DNS).

[darkerside → kubanczyk]

I stand corrected