Got the same thing, reported the dude for phishing, proceeded to look up the added domain on google out of curiosity.

it's xv . xyz added to the end of the normal forum domain, which seems to be a money clickbait thing. Then again, from the other two people in this thread that have received it, we're all in different worlds and I'm not sure how likely it is that one guy from cact is hopping everywhere in aether just to get click bucks.