I gave it a try and it seemed to not like my selection:

sanctum $ /usr/pkg/bin/perl ./pkg_notify.pl 
incompatible versionning format for package bicom-1.01
- checking for newer version of archivers/cabextract
 \ actual distname version: 1.0
 \ master site: http://www.kyz.uklinux.net/downloads/
403 Forbidden at ./pkg_notify.pl line 73.

sanctum $ head /usr/pkg/etc/pkg_notify.list 
archivers/bicom
archivers/cabextract
[ ... ]

Cheers,

Ben