A crucial piece of work that my manager and I have worked on was shared with the wider management team today. They were unaware that I had worked on the piece with him, and sat in the office disparaging the work and talking about all the ways they were going to change it, rather than do as he asked by the deadline.
I tried to step in but they are senior to me (but below him as CEO) so I decided to give my boss the heads up that he wasn't going to get the expected piece of work by the deadline. I emailed him to say that I hated sending a snitchy email (he and I are close so do talk about almost anything workwise, despite our different levels) but that the pushback he had expected had blown out of proportion. I honestly wasn't doing it drop anyone in (didn't use specific names but we're a smallish team) but because I know he's close to snapping with workload and had earmarked a slot at about 10pm tonight to deal with this at home. I wanted to let him know that he would need to set more time aside when the deadline came as the work would have changed a lot.
Except I sent this email to his 'fake-official' account that we use for mailing out from, rather than his actual private work email account. All the people involved and their juniors have access to this account. I've managed to get one of them to delete it for me, but only when I realised half an hour later. I don't know who's seen it or how badly this might land :(
I don't know whether to just pretend it hasn't happened, tell my boss, or proactively apologise to those involved.