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Can I hide email addresses of the recipients?

Yes. Enter them like this: Senator 1, jo.bloggs@example.com The dropdown will have only Senator 1 and not the email address. However, if the sender is required to enter his/her email address and the email bounces back for some reason, it will come back to the sender and disclose the email address of the recipient. Not your fault!

Can I make sure the senders use real email addresses?

Check on "Validate sender's email address" option in the configuration section and every sender will get a confirmation email with a link. The actual email with the card will be dispatched only of the link is clicked. You do not have to do this. You can make it free and open with no sender's address required.

What can I use this plugin for?

Anywhere where you want to add a bit of creativity and emotion to the message. If all you are after is a plain message then send a plain text email instead. Invitations, get well cards, campaigns and activism are the most obvious applications.

What sort of designs can it handle?

The plugin is agnostic to the type of design as such. It can be virtial cards or email signatures or internet banners or buttons for websites or badges, whatever your imagination can dream up.