How do I check this??

I was going through my account lists and came across an account with an email ending in @gaiaonline.com anyone know how to check emails ending with this?

I think it's mail.gaiaonline.com

tried that but my firewall has the site blocked, apparently its not an official site for gaia

type in
gaiaonline.com/p/whateverthevictimis@gaiaonline.com