Enormous is >5MB

People - if you are sending anything larger than 1MB in an email message to huge numbers of other people, you need to just post it to your site and then send out an email alerting them of the URL and new content. Better yet, set them up for an alert on the list or library where you post it so that it can all be automatic.

The exchange servers will thank you.

Remember kids, 5MB turns into 10MB when emailed. Those binary files have to be converted to text - which sometimes more than doubles the file size! Sending a 5MB file to 200 people is just stupid. And clogs up the internets.