Maildrop error: Unable to open filter file, errno=13

I'm still at the point that, with ISPConfig firewall activate, when I reboot the server I can see this error in the mail.log

Code:

spamd[2253]: dns: sendto() failed: Operation not permitted at /usr/share/perl5/Mail/SpamAssassin/DnsResolver.pm line 395.

The strange thing is that the other server (the replication) with ISPConfig firewall activate, have no errors...

Anyway, should it be a problem of permissions in that file?
My permission of that file is:

Code:

ls -la /usr/share/perl5/Mail/SpamAssassin/DnsResolver.pm
-rw-r--r-- 1 root root 16455 2008-06-10 10:20 /usr/share/perl5/Mail/SpamAssassin/DnsResolver.pm

Thanks
Michele

 

Ok Till,
but in this case, which log file I've to read?
Because in /var/log/mail.log I can not see nothing new... (was the file where, after reboot, I was reading the error...)

Thanks
Michele

 

Ok thanks Till,
I solved it setting up the firewall of my ISP instead of the one of ISPConfig...

Thanks again
Michele