[imp] Undefined index: maildomain // IMP Error, which causes an displayed error-msg to end-user

[michael.groene at zel.uni-hannover.de]

Hello,

at every login I get this error in horde's logfile:
2011-04-04T14:29:57+02:00 NOTICE: HORDE [imp] PHP ERROR: Undefined  
index: maildomain [pid 30913 on line 387 of  
"/var/www/horde4/imp/lib/Auth.php"]

We use full E-Mail-Addresses to login, so I did not configure the  
maildomain in backends.php. I can ignore this error, can't I? Should I  
set the maildomain="" or something like that? However login is  
successfull.


Additionally I got this error, in that moment I tried to open an  
folder in dimp.
I got no futher details than the two lines from logs. The frontend  
displayed an error: "Fehler während der Kommunikation mit dem Server."
Nevertheless the folder was opened, and everything seems to work okay.  
Any idea, what this is about?
2011-04-04T14:30:40+02:00 ERR: HORDE [imp] Bad IMAP request: Invalid  
binary section [pid 30913 on line 212 of  
"/usr/share/php/Horde/Imap/Client/Base.php"]
2011-04-04T14:30:41+02:00 WARN: HORDE [imp] PHP ERROR: json_encode():  
Invalid UTF-8 sequence in argument [pid 30913 on line 242 of  
"/usr/share/php/Horde/Serialize.php"]