I am not sure if it is good to share the name of such services in this thread/post.
I will suggest you to google with the search term "Free Email Attachment Service".
First result entry on the result page seems to be useful, according to me.
"Send large files - transfer delivery - FTP Replacement"
I hope this will help.
~~ Pradeep Bishnoi ~~
This can be done using SAP BOX , I have added the following information from the SAP WIKI
Here is a handy video : https://mediashare.wdf.sap.corp/public/media/Using+SAP+Box+on+your+Windows+7+PC/0_lm70agpj
The Mac version of Sap box is only available as a HTML version and can be accessed at the main Sap box site : https://share.sap.com/
Here is a handy video to help : https://mediashare.wdf.sap.corp/public/media/Using+SAP+Box+on+your+Mac/0_4etuq3u1