[Users] "-ERR Authentication failed" while trying to access RuggedInbox account

[Paul]

On Sat, 24 Oct 2015 12:54:33 -0500
Mario Castelán Castro <marioxcc.MT at yandex.com> wrote: 

> What is causing this problem and how can I fix or work around this?.

For UserID try using your complete email address rather than just
your username.

with regards

Paul