[horde] Ingo: can't save/activeate scripts - The driver said: "Authentication failed."

[Nils]

Hi,

I am using horde 6.0.0alpha6. I can see existing filters in Ingo but  I 
can't save, activate or deactivate them. I get two messages. One says 
that the activation was successful and the other says: 'Error activating 
the script. The driver said: "Authentication failed."'.

Syslog shows a failed attempt to authenticate to sieve using only 
USERNAME instead of USERNAME at FQDN.

Kind regards