Cannot modify header information - error if spamassassin has detected spam

[tom]

I get this errors after spamassassin hat detected spam:

Warning: Header may not contain more than a single header, new line detected. in /home/admispconfig/ispconfig/web/webmail/inc/class.uebimiau.php on line 467

Warning: Cannot modify header information - headers already sent by (output started at /home/admispconfig/ispconfig/web/webmail/inc/class.uebimiau.php:467) in /home/admispconfig/ispconfig/web/webmail/inc/class.uebimiau.php on line 469

What to do?

[falko]

Have a look here:
http://www.howtoforge.com/forums/showthread.php?t=2842
http://www.howtoforge.com/forums/showthread.php?t=2945