Sebastiaan de With on just how badly undelivered email notifications are:

That email I got back was apparently because my attachments were too large. I can barely read that email — let alone my grandmother. Machines can read it just fine, though. Here’s an idea: machines shouldn’t slap us in the face. They should help us along if they fail to do our bidding.

This couldn’t be more true.

The way we’re informed when something goes wrong with our computers is generally awful, hardware and software alike – even with Apple products. 

Sebastiaan posted a great mockup of how Apple Mail could look when an email bounces back as undeliverable.

You’ll have to follow the link to check it out.