[horde] sent mails are not saved in sent-mail

[Jens Grüntjes]

Hello list,

after running a pear upgrade yesterday a couple of Horde_* packages  
were upgraded.

After those upgrades I encounter an error every time I send mail a  
mail saying "Message sent successfully, but not saved to sent-mail".  
The horde-log shows

2012-11-21T07:14:12+00:00 INFO: HORDE [imp] 192.168.0.160 Message sent  
to Jens Gruentjes <jens.gruentjes at provider.de> from jens [pid 31751 on  
line 866 of "/var/www/horde/imp/lib/Compose.php"]
2012-11-21T07:14:12+00:00 ERR: HORDE [imp] Der E-Mail-Server konnte  
den Inhalt der Nachricht nicht auswerten. Can not process the binary  
data [pid 31751 on line 382 of "/var/www/horde/imp/lib/Imap.php"]

The error message "Can not process the binary data" seems to be an  
error code from the cyrus mail server we're running.

I tried sendign with and without signature, with empty mail-body, with  
text, but no difference. Saving sent messages always worked but seems  
to be broken after the upgrades from yesterday. Unfortunately I don't  
have the output from the pear upgrade command.

Can someone help me out?
-- 
Viele Grüße
Jens