Why is it that after I have created a mail message that it disappears and
lets unwanted messages back in? For example, I create a message rule that
deletes any message where the subject contains the word 'viagra', however the
next time I look in my inbox there is a message where the subject contains
the word 'viagra'. Furthermore when I check my message rules the rule has
disappeared. This has happened more than once and eventually the rule may
stay after I have recreated it more than once.

Can anyone help or does anyone have the same problem?