Just did some little research and found out that our infamous spammer is making several dummy accounts, which in all likelihood is so that if one account gets taken down, the spammer will use the other one and so on and the cycle repeats itself:
https://www.mycast.io/search?q=Outlook&kind=user
Mods/admins, please, do something about this, several days have passed and those guys are still here. I have a bad feeling that the same spamming spree situation as what happened during October is gonna happen again at some point (or maybe even worse).