Periodically we receive complaints from our users that their Portside messages are coming in blank. In our research, we have found that some providers (particularly Earthlink) insert headers to incoming messages that prevent the messages from being readable.
You can help us figure out if this is what is happening with you by sending us a copy of your entire message (aka - the message source). Every email program has a different way of showing you the full message source. [About.com has a good tutorial covering the major ones]. Please review those instructions and send us a copy of your full message and we can help you determine why your messages are not displaying properly.
Once you know, you can follow up with your provider to ask them why the vast majority of Portside readers can properly read their email messages, but yours are not coming through properly. Please feel free to cc: us on your communication, in case there is anything we can do to accommodate your provider in displaying these messages properly.
Thanks for your help in getting to the bottom of this!