现在用的插件是NYU8的Email Filter，解决了Email Whitelist插件导致无法正常注册的Bug。
现在已开放所有邮箱注册
I tried to register for the fresh rss akarinliu server, I even changed the initial email for another one, but no validation message arrives in my email to confirm the registration, the site returns this error message
We were unable to send you an email due to a configuration error on the server.