While anything related to weather satellites and imaging is fair game, please avoid getting into military satellites used for communications or intellegence gathering.
Discussion is also open for the many foreign weather satellites.
The NOAA messages sent on this list are diverse and cover both geostationary and polar satellites. Five message groups are available to customize the mailings to your needs. It is possible to combine groups, requesting GOES, General, and Polar TBUS messages, for example. All subscribers are set to receive all messages. Of course, if you feel your message might be of interest to everyone, go ahead and post it.