[imp] Error while sending mail

[Thomas Booms]

Hello,

i get this error msg always after writing a new msg.

Please be a little patient with me, i'm new with horde.

Thanks in advance,

Thomas

My configuration:
-----------------
Horde Versions
Horde: 2.0
IMP: 3.0
Turba: 1.0
PHP Version
View phpinfo() screen
PHP Version: 4.1.1
PHP Major Version: 4.1
PHP Minor Version: 1
PHP Version Classification: release
You are running a supported version of PHP.
PHP Module Capabilities
FTP Support: Yes
Gettext Support: Yes
IMAP Support: Yes
LDAP Support: Yes
MCAL Support: No
Mcrypt Support: Yes
MySQL Support: Yes
PostgreSQL Support: No
XML Support: Yes
Miscellaneous PHP Settings
magic_quotes_runtime set to Off: Yes
PHP Sessions
Session counter: 1
To unregister the session: click here
PEAR
PEAR - Yes
Recent PEAR - Yes
Mail::RFC822 - Yes
Log - Yes
DB - Yes