On: Gmail Improves "Undo Send"

[Jkeg]

It would have to be based on any interaction the receiver has with the email, including viewing the inbox. However, if we're already worried about that level of privacy, even that change would do no good since it would mean the sender would know when the receiver checked their inbox.

[FooBarWidget → Jkeg]

In other words, the email may or may not exist until you observe it? Brilliant, they should market it as the first commercially viable quantum cloud.

[mkramlich → FooBarWidget]

Heisenmail.com would be a great name for it

[modeless → Jkeg]

Also, this would be impossible when mailing anyone who checks their GMail using POP, IMAP, or Exchange ActiveSync.