I wrote an article today about zipping files that you attach to an email for a number of reasons, one of which was to keep the size of both your mailbox and your audience’s mailbox low. Along these lines, if you find that you are having a mailbox size problem, one trick that can help is to go back to your sent mail and delete any large attachments that you don’t need anymore from those messages. All you have to do is open the message, remove the attachment, and then save the message. You keep the message text, but lose the attachment.

This works really well for me using Microsoft Outlook, you should take a look on your local email application to see if there is a way to do this as well.