Sign Clean Messages not working without -U

Ram ram at
Fri Dec 28 09:47:14 GMT 2012

I have  MailScanner version 4.84.5 on CentOS 6

Even if I set in MailScanner.conf

Sign Clean Messages = yes

messages  dont get signed.
I enabled the -U switch in /usr/sbin/MailScanner and now it works but 
with warnings
like this

Insecure dependency in open while running with -T switch at 
/usr/lib64/perl5/IO/ line 185.

What does this mean ?  Is -U not recommended ?


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