Temporarily blacklisted IP address - iphone will not connect to emails

When trying to look at my email on my iPhone it won't update emails and says Server code "ALERT", server message "Temporarily blacklisted IP address. I can access my emails perfectly when on a laptop.  The problem exists only on my iphone.  I read here that other users have shut off WIFI on their iphones and this does work however a permanent fix is required since I live in a building with managed WIFI and the routers in every unit are NOT XFINITY.  Please solve this.