How are the attachments stored? I have had a user who will insist on attaching large screen captures or attaching the files in his reply which were attached to our previous reply.
Sorry for the delay replying to this.
In MailManager you will see path like:
which would be the third attachment in the second message on ticket 5.
If you wanted you could visit 000005/2/manage and delete the attachment if it was taking up a huge amount of space.