TBD. Please contact us in the meanwhile.
You are trying to login into Roundcube, and the following error appears.
This article will help you find your emails in some situations.
When you try to send an email, this error usually occurs because the email address does not exist in the remote server.
You sent an email, and it was bounced (returned) back to you.
Use the following settings to read and send email messages in mail clients, like Microsoft Outlook and Apple Mail.