Username or EmailPassword
True, although usually these bouncebacks don't include the original attachments, so the reply should've only been a few KB at most. What I do find interesting is that the limit is something like 34MB - a limit which may have convinced the poster in the past that it *was* ok to be sending uncompressed Photoshop documents as attachments.
I've had to spend considerable time and effort over the phone to various people to explain to them about filesizes, how to find them out for files, and why they are important. In these times of 100Mbit broadband, multithreaded email clients and terabytes of hard drive space, the average user has no need to worry about file sizes in everyday life... Which is fair enough in most cases, but shouldn't mean they end up completely ignorant to it either.
Even the email itself, without attachments, can be made more "bandwidth-friendly" by using plain text. It's rare that I use anything other than plain text to send emails.