The file name listed in the error looks off. It looks like the filename may have been changed to something with a colon character and it may be confusing the scp client.
The default file name is just "mail" so your file name ends up like this
mail.@20120809T105149.s
It looks like the file name entered might be something like "here:" because this is what is listed in the error
here:@20120809T105149.s
You can call it here, there, whatever. Just make sure that there are no special characters and that may help.