After a period of time, graphics in JPEG format embedded in message can no longer be viewed and are replaced by a symbol indicating "file cannot be found". As a test I created a draft email with my signature and then kept in the Drafts folder for several weeks.

I checked it each day and for the first several weeks it was fine. Finally today it appeared and the signature was missing (see attached graphic).

What is happening and can you fix this? The same problem occurs in all my email messages and involves all images that are embedded in the message. After some period of time the graphics just disappear.

Thanks.