In order to send the videos via email using Microsoft Outlook, you will need to make sure that the attachment size is not exceeding 20 megabytes (20480 KB). You can try to create videos using a lower resolution:
After that, you can try to send them one by one. However, instead of Microsoft Outlook, I suggest you use an online transfer service that will allow you to attach large files. You can use WeTransfer, Hightail, DropSend, SendThisFile or Filemail.