File Storage Limit Exceeded

File Storage Limit Exceeded

I cannot attach documents to e-mails any more because I have exceeded my file storage limit.  This happened because I removed a user and thus reduced the limit.  In fact I am well past the limit now.  How do I delete my previous e-mail attachments on mass so I can carry on using e-mail?

I have looked at previous answers to this and it looks like you will expect me to go through all my old e-mails and delete each one separately.  I don't have time to do that, surely there is a way to delete them all at once.

Regards

Martin