A weird spam email

[#1]

Weird because it came from myself!

That's right, an email warning me that my inbox was full was sent to me by me according to my usual simple check of hitting the Forward button.

I don't have the wherewithal to delve deeper so has anyone else had similar?

[#2]

Yes. I also had a plausible looking "Inbox full" spam message yesterday.

[#3]

Had several seemingly the same. Have chatter to the help line but not really got any further as to whats happening.