> I am working on a mail reader / tosser and was wondering if anybody out 
 > there knows how fmail takes the following two address and arrives at 
 > the bundle name.

The author of FMail is probably the only person that can tell you how his
software generates outbound bundle file names.  Individual mail processors
use different generation techniques.

In reality it is virtually impossible to make any assumptions on where a
mail bundle came from by parsing the bundle's filename alone; you must
process the mail packets contained therein.

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