We have made some updates to the core systems of our service during April. One change is a more comprehensive check for e-mail address validity during registration. Account creation with temporary/disposable e-mail addresses are not allowed on our site (refer to our Terms of Service) and our systems will detect most of these disposable e-mail providers. It is important to have a valid e-mail address in your profile for example if you forget your password (the reset link will be sent your e-mail). So now with this reminder it's a good time to check that all data in your user profile is valid and up-to-date!