It was none of those usual type things. They get binned straight away.
In the end I ran a ruler over the probabilities, based on some details.
- HDR photos - Apple thing
- Email address linked to an Apple device
- Time of sending was close to photo (jpg) time stamp and plausible UK time
So I opened one. Just some “here I am at Black Rock” images. Suspect someone’s email typing got autocorrected.