I was having a bit of a problem today with my work email account. Someone needed to send me a program, but the server antivirus was (rightly) quarantining it.
Rather than login and add an exception I thought a better solution was to allow uploads to my dropbox, The script I used was pulled from http://lluciani.com/. There are other similar ones based on the same dropbox upload php, but this one allows you to select multiple dropbox accounts and use a password.
Obviously you will need a webhost which supports PHP to use this.