I am not sure where to start with this, I dont even know what program would be responsible (maybe sendmail).

I will be setting up a small email server, and want to make it as safe as possible. I am wondering if there is a way to make the server strip all attachments from all email messages and put them in a sub-directory of the users' mail directory, and then they can download the attachment separately. (Kind of like the setting in various email programs that tells it to not download attachments, then the user has to click the attachment button to download, except I will be forcing this to happen).

Any ideas?