Recently there are created a large amount of spam accounts.
There is an implementation of countermeasures in order to prevent spam-flooding now.
For new users:
--- READ CAREFULLY INSTRUCTIONS FOR THE REGISTRATION
---- YOU HAVE ONLY ONE CHANCE TO REGISTER, if you fail your IP is banned for a while.
--- THE REGISTRATION PREFERS PRIVATE/UNIVERSITY/ETC DOMAINS OVER GENERIC. DO NOT USE DISPOSABLE EMAIL ADDRESS, they are blocked by default (now about 800 domains).
--- IF YOU HAVE A PROBLEM PLEASE EMAIL IT TO: іnfо@nоtаt.іо