Files larger than 5mb may not leave your email server, and if they do, they may not make it to ours.
Use www.wetransfer.com to send files larger than 5mb. It is a free service and allows up to 2Gb of data transferred at one time. Just put in your email address, and ours ( firstname.lastname@example.org ) and upload your files. We will receive a notice that we have files waiting. You will receive a notice when we download.
Note that if you have very large files it will take some time to upload.