We often use the internet to move large files around. Many of us use mail servers that are limited in their ability to handle those files. Or we just don’t want to have to deal with sending the same large file out, over and over again.
I wouldn’t use it for anything confidential or time-sensitive (just in case), but File Flyer is a free service that allows you to post a file out there in cyberspace. You then give File Flyer a list of e-mail addresses and those folks are told where to go in order to download your file. As far as I can tell there’s no inappropriate use of the provided e-mail addresses.