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Handing mail from multiple UNIX accounts
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I myself recieve mail on my mail work machine.  I then remotely retrieve my
mail to a inbox folder inside may account directory, which I then download to
my home machine to handle.

When I want to retireve new mail from home I then upload the changes to those
mail folders back to my work machine, "incorperate" any new mail that has
since arrived into those folders, then download the changes back to my home
machine.

When finished at home I upload my mail folders back to work, and leave them
there so I can use them on my work machine. When I go home again I just
download those folders again (with any new mail and changes).

Basically. My mail folders are portable (just a sub-directory of my home) and
the current usable location moves with me from account to account.  I do NOT
copy all my folders, I use a program called rsync to update only the changes
to the files in that sub-directory from one machine to another.

The trick is to ONLY allow updates ONE the current "primary" location, though
that location can move from place to place. Basically you need to keep in
mind.

  Wirth's Rule:     Never store data in more than one place,
              sooner or later you will update one and not the other.

  Anthony Thyssen's corollary to Wirth's Rule..
         Only store and update data in one place,
         but have all copies generate from that one primary source.

  Anthony Thyssen's second corollary to Wirth's Rule..
    Data changes should only be made to a single "primary" data store.
    But a "secondary" can be promoted to a "primary" after syncronization.

Warning for auto-sorting mail into folders...

With the above scheme you can not allow your mail reciever to modify your mail
folders directly, unless you exempt that folder from the 'migration' method
described above.

If you want to have the mail sort automatically while still allowing you to
edit on a remote machine, you will need to have your mail sorter store NEW
mail in a special temporary 'incomming folder' that does not migrate.  Then
when you 'incorperate' your normal mail, the special 'incomming folder' mail
can also be 'incorperated' or 'moved' into there primary folder.

That is new mail and changes must only be made, when the system is told that
its is now the "primary" location, and it is okay to make changes.  That is
store the new mail into their final folder location only when it is okay to do
so.

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