Dovecot permissions

src/freedombone-utils-setup

     if [ -f /usr/sbin/exim4 ]; then
         chmod u+s /usr/sbin/exim4
     fi
+    if [ -f /usr/sbin/dovecot ]; then
+        chmod u+s /usr/sbin/dovecot
+    fi
 
     set_sticky_bits