Error trying to edit documents

[brichr]

I set up a document library so that i can email stuff to it. I am able to successfully email documents to this Doc Library, But I am unable to edit documents that have be put into this library by email. If i open the doc library through explorer and add documents into the library, these documents I can edit.

So if emailed i cant edit, I get this error
"Required Properties To save to the server, correct the invalid or missing required properties"

But I cannot seem to find the correct properties to correct or edit to allow me to save this back to the server.