??? 

I already know what the email address(es) are - why would i need to see them in the audit log.
I would like to see a log of the reason for the failure eg:

Recipient 1 - delivered successfully
Recipient 2 - failed to deliver due to error - ### some useful error message here

Recipient 3 - delivered successfully

As it stands, I've had to resend to multiple people multiple times and had to follow it up with a manual email apologising just in case they got many or no copies of that invoice.

This is not a feature request - this should be a basic component of the system.

I don't know why I bother posting here, it generally just seems like a waste of time!