I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.
No you aren't, you fucking moronic computer programme, you can't even react to situations outside your limited programming, never mind be sorry about things. You aren't going to change your behaviour towards me or my mail one jot as a result of this failed delivery.
What's more, that mail never even originated from me in the first place; it appears to be a virus or worm that has been sent out by a computer claiming to be me, so you don't even have the wit to tell if I'm the person you were talking with in the first place.
Thirdly, the error condition you report is one that you could easily have checked for when the person you believed was me as initially trying to had off this mail to you, and you could then have complained about it during that conversation, rather than accepting the mail and then having to go around trying to return it.
And finally, when you do try and return mail, the correct thing to do is to identify yourself as <> because then we all know that you are attempting to return a failed delivery, and don't want to be told that your message can't be delivered because you're only a stupid computer, and not a real person and you've got no idea what to do with failed failed delivery notifications.