In each email you can add documents to be included with the message. You can send up to three files with a maximum capacity of  1MB each one. 

Accepted files must have one of the following extensions: txt, doc, docx, xls, xlsx, ppt, pptx, rtf, odt, ods, pdf', zip. rar, mp3, mov, mp4, qt, png, jpg, jpeg, gif, bmp, tif, tiff.