This I cannot think has happened before

[#1]

Over many years emails from one organisation have been directed into address something@name.plus.com, and there have not been any problems whatsoever.

Today an email from that source was found in my name @ name.plus.com account marked SPAM.

“Envelope To” and “Received for” are as they should be. Am I having a moment of amnesia, as I cannot recall any item being automatically diverted from its intended destination.

[#2]

Have a look here - Spam - as it may say you should send it to a specific mailbox

Just checked mine and it says redirect to username@username.plus.com as the third option (fortunately not ticked) and checking there is a mailbox of that name which has been set as the default and there never used to be so something has added it

Further checking - mine says redirect to Spam Folder but I don't have one

[#3]

In my case it's amnesia!

OTOH I shows that I can't be that worth spamming.