[imp] renderMIMEPart PHP Error

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Hi,

We've expected a fatal error with renderMIMEPart  (  
horde/imp/lib/Contents.php ). It has filled the /var partition within  
30 minutes.

Here's the beginning of the log:
2012-09-24T12:03:14+02:00 WARN: HORDE [imp] PHP ERROR: rewind()  
expects parameter 1 to be resource, null given [pid 10334 on line 511  
of "/usr/share/horde/imp/lib/Contents.php"]
2012-09-24T12:03:14+02:00 WARN: HORDE [imp] PHP ERROR: feof() expects  
parameter 1 to be resource, null given [pid 10334 on line 512 of  
"/usr/share/horde/imp/lib/Contents.php"]
2012-09-24T12:03:14+02:00 WARN: HORDE [imp] PHP ERROR: fread() expects  
parameter 1 to be resource, null given [pid 10334 on line 513 of  
"/usr/share/horde/imp/lib/Contents.php"]
2012-09-24T12:03:14+02:00 WARN: HORDE [imp] PHP ERROR: feof() expects  
parameter 1 to be resource, null given [pid 10334 on line 512 of  
"/usr/share/horde/imp/lib/Contents.php"]
2012-09-24T12:03:14+02:00 WARN: HORDE [imp] PHP ERROR: fread() expects  
parameter 1 to be resource, null given [pid 10334 on line 513 of  
"/usr/share/horde/imp/lib/Contents.php"]
2012-09-24T12:03:14+02:00 WARN: HORDE [imp] PHP ERROR: feof() expects  
parameter 1 to be resource, null given [pid 10334 on line 512 of  
"/usr/share/horde/imp/lib/Contents.php"]
2012-09-24T12:03:14+02:00 WARN: HORDE [imp] PHP ERROR: fread() expects  
parameter 1 to be resource, null given [pid 10334 on line 513 of  
"/usr/share/horde/imp/lib/Contents.php"]
2012-09-24T12:03:14+02:00 WARN: HORDE [imp] PHP ERROR: feof() expects  
parameter 1 to be resource, null given [pid 10334 on line 512 of  
"/usr/share/horde/imp/lib/Contents.php"]
2012-09-24T12:03:14+02:00 WARN: HORDE [imp] PHP ERROR: fread() expects  
parameter 1 to be resource, null given [pid 10334 on line 513 of  
"/usr/share/horde/imp/lib/Contents.php"]
2012-09-24T12:03:14+02:00 WARN: HORDE [imp] PHP ERROR: feof() expects  
parameter 1 to be resource, null given [pid 10334 on line 512 of  
"/usr/share/horde/imp/lib/Contents.php"]
2012-09-24T12:03:14+02:00 WARN: HORDE [imp] PHP ERROR: fread() expects  
parameter 1 to be resource, null given [pid 10334 on line 513 of  
"/usr/share/horde/imp/lib/Contents.php"]

Regards.

SSRI Team.
Université Panthéon Assas.