Known contacts keep diverting to Junk in iCloud Mail
One particular known contact keeps diverting to my Junk folder in iCloud Mail despite numerous troubleshooting tips being followed, e.g:
The person is definitely listed in my contacts
Any instances where an email was in Junk i've clicked the Not Junk button and moved it to inbox
I've reset junk mail filtering
I've also marked this particular contact as a VIP
Still their emails go into Junk.
I'm using iCloud Mail but obviously this issue is the same across all my synced devices (iPhone, iPad, MacBook Pro).
Any ideas?
MacBook Pro 15″, macOS 11.6