the file size is 217.910 Kb.
217kb will definitely go OK as an attachment, unless that dot between 217 and 910 is actually a comma!
To be triple-sure, try it in another computer, but if you can access the DVD already on your two laptops, then it sounds that something fishy is occurring/not occurring at his end...
If it is indeed 217mb, rather than use a disk, you could use Google Drive or Dropbox to get it to him. If forced to use a disk, I'd use a CD (around 600mb capacity and much more "standard" than a DVD-RW). DVD-RWs can be problematic.