Nerd Fitness not identifying a type of email address

[RubiksCat]

@Tanktimus the Encourager

I'm attempting to change my email address to my "ymail.com" account but the forum keeps telling me "ymail.com" is not a valid email address.

 

I changed my account email address to a random throw-away 10-minute mail email address but I would like to change it to my "ymail" one if it's possible.

[Tanktimus the Encourager]

I had to make ymail an unusable address because so many spambots were using ymail as an email domain. When I blocked it spam posts went way down.