Of course many people know this, but I've been using emails for decades and didn't realise this, that if you hover over the apparent email address of a sender in Outlook and similar, you get the true address of the sender if is a scam email address that has been doctored. So an apparent HMRC email showed paddyodonahue@ whatever. Not being racist, it just happened to be the case. I did wonder whether to reply to that address to remonstrate, then decided to block it.