^ IP address is different each time.
Right now those spams are almost stopped.
I find "Never treat mail from MyUni.edu as spam" rule to be more troublesome than useful, so I've removed it on my account and set the spam filter to be very strict and put all designated spam into AUTO-DELETED-SPAM.
Earlier regardless of the strict spam filter emails from my account were passed through because of the above rule.
Thanks for your help. :)