I keep getting alerts from Google along the lines of

Sign-in attempt was blocked
mark%phillipsoasis.com@gtempaccount.com

With a button to "Check Activity". The button takes me to a Google sign in
page for mark%phillipsoasis.com@gtempaccounts.com asking for my password. I
don't use this address. I do own the domain phillipsoasis.com and have an
email address mark@phillipsoasis.com

Is this a scam/spoof or something real?

Thanks!

Mark