[Mimedefang] Exporting an eml file from MIMEDefang

[Kevin A. McGrail]

> What one should disallow is exactly two periods in a row.  One, three, or more than three won't have the effect of climbing a filesystem's directory tree.
>
> Watch out for tricky mime-encoded subjects too.
This also leaves lots of room for problems so I'd recommend the QueueID 
as the basis for the filename.  It's unique, dos proof and filesystem safe.

Regards,
KAM