You can send large email attachments for free (up to 50mb) using YouSendIt. This is tremendously useful for sending designs and images that would normally bounce back if emailed. From a Mac user perspective they have an app and some plugins for Photoshop and Acrobat.

But sometimes I have found that the YouSendIt app will refuse to send and come up with an error message that says my connection to the internet is broken, when it patently isn’t. I mention the following fix mostly because I could have done with it when sending some large files against the clock this morning! Things always go wrong when you need them most. I searched the internet in vain. Only after I had calmed down did I start to think what the answer might be…

The solution – for the record – is to close the app, bin the following files and folders (at your own risk of course):

in <your-home-folder>/Library/Application Support/YouSendIt

in <your-home-folder>/Library/Preferences/com.yousendit.YouSendItExpress.plist

and then start the app again. To get to your Library folder under Lion, hold the alt key while pressing the Go menu in the Finder.

The app, by the way, at time of writing is YouSendIt Express. There is a “Desktop” version coming soon that I imagine allows for online storage.