error: forged header

[Jan Vergeer]

Hello,
 
I get a lot of errors in my postfix.log file that look like (where user at hetnet.nl is just a random user):
May 27 14:45:22 Mail <info> postfix/pipe[8572]:5A5E83AEFED: to=<user at hetnet.nl>, relay=kolabfilter, delay=1.7, delays=1.5/0/0/0.2, dsn=5.7.0, status=bounced (permission denied. Command output: Invalid From: header. MAILER-DAEMON at derank.org (Mail Delivery System) looks like a forged sender)
 
I also get messages like:
May 28 12:28:46 Mail <info> postfix/pipe[15170]:08F2C3AEFEE: to=<user at hotmail.com>, relay=kolabfilter, delay=0.83,delays=0.45/0/0/0.37, dsn=5.7.0, status=bounced (permission denied. Command output: Invalid From: header. "User" user at derank.org looks like a forged sender)I am running kolab server 2.2 RC1
 
Greetings,
Jan Vergeer
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