Do you want to save your Email as a document without copy-pasting from your Email? Yes, it is possible by enabling the new Gmail Labs feature called Create a Document.
To enable this feature move to Gmail Lab’s tabs and find out Create a Document feature and enable it as shown below picture.
After enabling this feature in your Gmail Labs tab move to your inbox and open any Email check out at the right side of the Email nearby time and date you can see create document option as shown below picture.
After clicking on Create a document a new Google docs window will be opened in that all your data will be imported into the Google docs and attached images also included in Google Docs.
Now you can edit the content and download as a document under any format like HTML, MS Word, PDF, Txt or Open office document, etc.