Use the Registration page to create what will be the From address and link it to a real email account you own. If you skip this step the Listener on th.org will reject the MDN.
On the Direct Send page...
Fill in Direct From Address - use the addr you created in step 2
Fill in Direct To Address - name@direct.microphr.com
Choose document, message format, and signing certificate
Do not fill in encryption certificate. It will be discovered via DNS
Assuming the From address is registered, you will get back the MDN to th.org, it will be processed like
any other message to the Listener and you will get notification to the email addr you registered in step 2.