I find the bellow error in /var/log/maillog:
Aug 9 03:30:02 exp3 spamd[1591]: spamd: connection from localhost [127.0.0.1] at port 32925
Aug 9 03:30:02 exp3 spamd[1591]: spamd: setuid to admin succeeded
Aug 9 03:30:02 exp3 spamd[1591]: spamd: processing message <1155086983.7002.7.camel@fc4> for admin:500
Aug 9 03:30:02 exp3 spamd[1591]: Can't locate URI/Escape.pm in @INC (@INC contains: ../lib /usr/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.5 /usr/lib/perl5/5.8.5/i386-linux-thread-multi /usr/lib/perl5/5.8.5 /usr/lib/perl5/site_perl/5.8.4/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.3/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.2/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.1/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.0/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.4 /usr/lib/perl5/site_perl/5.8.3 /usr/lib/perl5/site_perl/5.8.2 /usr/lib/perl5/site_perl/5.8.1 /usr/lib/perl5/site_perl/5.8.0 /usr/lib/perl5/site_perl /usr/lib/perl5/vendor_perl/5.8.5/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.4/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.3/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.2/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.1/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.0/i386-linux-thread-mult
Aug 9 03:30:02 exp3 spamd[1591]: Use of uninitialized value in concatenation (.) or string at /usr/lib/perl5/site_perl/5.8.5/Mail/SpamAssassin/Plugin/SPF.pm line 288, <GEN6> line 24.
Aug 9 03:30:02 exp3 spamd[1591]: spamd: clean message (0.0/5.0) for admin:500 in 0.0 seconds, 733 bytes.
Aug 9 03:30:02 exp3 spamd[1591]: spamd: result: . 0 - scantime=0.0,size=733,user=admin,uid=500,required_score=5.0,rhost=localhost,raddr=127.0.0.1,rport=32925,mid=<1155086983.7002.7.camel@fc4>,autolearn=ham
Aug 9 03:30:02 exp3 spamd[1589]: prefork: child states: II
Any help welcomed.
Aug 9 03:30:02 exp3 spamd[1591]: spamd: connection from localhost [127.0.0.1] at port 32925
Aug 9 03:30:02 exp3 spamd[1591]: spamd: setuid to admin succeeded
Aug 9 03:30:02 exp3 spamd[1591]: spamd: processing message <1155086983.7002.7.camel@fc4> for admin:500
Aug 9 03:30:02 exp3 spamd[1591]: Can't locate URI/Escape.pm in @INC (@INC contains: ../lib /usr/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.5 /usr/lib/perl5/5.8.5/i386-linux-thread-multi /usr/lib/perl5/5.8.5 /usr/lib/perl5/site_perl/5.8.4/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.3/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.2/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.1/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.0/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.4 /usr/lib/perl5/site_perl/5.8.3 /usr/lib/perl5/site_perl/5.8.2 /usr/lib/perl5/site_perl/5.8.1 /usr/lib/perl5/site_perl/5.8.0 /usr/lib/perl5/site_perl /usr/lib/perl5/vendor_perl/5.8.5/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.4/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.3/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.2/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.1/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.0/i386-linux-thread-mult
Aug 9 03:30:02 exp3 spamd[1591]: Use of uninitialized value in concatenation (.) or string at /usr/lib/perl5/site_perl/5.8.5/Mail/SpamAssassin/Plugin/SPF.pm line 288, <GEN6> line 24.
Aug 9 03:30:02 exp3 spamd[1591]: spamd: clean message (0.0/5.0) for admin:500 in 0.0 seconds, 733 bytes.
Aug 9 03:30:02 exp3 spamd[1591]: spamd: result: . 0 - scantime=0.0,size=733,user=admin,uid=500,required_score=5.0,rhost=localhost,raddr=127.0.0.1,rport=32925,mid=<1155086983.7002.7.camel@fc4>,autolearn=ham
Aug 9 03:30:02 exp3 spamd[1589]: prefork: child states: II
Any help welcomed.