Hi Smittychat,
Thank you for replying. No I didn't sent from Gmail. It was from Outlook, which the one I have by registering my Microsoft Account with my Gmail account.
Out of curiosity, I check my "Outlook" named after my Gmail, and sent it to my (real) Gmail. I received that email in my (real) Gmail as sent from "me" (Outlook named as my Gmail).
I added a second alias email from another non-Microsoft email, from iCloud email, made it a primary and sent another email to my (real) Gmail. It was seen as been sent from the iCloud account but this time there is an additional note/information in sender
address "via outlook.com" next to the iCloud address. Also, a warning from Gmail that it cannot really clarify that it was really sent from iCloud (well, evidently).
So, up till now I am still confused as to what this "Microsoft Account" (under these different non-Microsoft email addresses)...real email address is?
So perhaps, your or anyone can help finding out where can I found my "real" Microsoft email is?
Thanks!