How to configure an email endpoint

Hi,

I am trying to configure an emailendpoint for my process but I'm having trouble with retrieving some email information.
Is this documented somewhere?
One problem at the moment is to retrieve the SendDate or ReceiveDate from an email. How do I make the mappings for this?

The other one is when I configure the emailendpoint to retrieve Attachments, I did this by mapping *.* to an Map-collection. Now I can get the attachments stored in the Map-collection, this works fine. But when there are no attachments at the email I keep getting an NullPointerException and my process is not invoked. But my process needs to be invoked with or without attachments.

Thanks in advance,