Please go to: Power Globe Subscription Page
You must be subscribed to the Power Globe in order to post to the list. In addition, the "From:" line of your e-mail to the listserv web page must match the e-mail address you used when you subscribed. Your e-mail address has most likely changed since that happened. You can update your e-mail address for the Power Globe by going to the Power Globe Subscription Page. You will need to unsubscribe your old e-mail address and resubscribe using your new address.
The listserver will now permit attachments, and scan them for viruses. However, the you are limited to files (after the attachment is encoded as a text file) that are 800 lines long or less. If you need to refer to a file that exceeds this limit, it would be better to post a link to a web page where the file could be downloaded by interested parties (most likely a small percentage of the total set of list subscribers).