[issue2814] Remove old classes from mailbox module

[Humberto Diogenes]

Humberto Diogenes <humberto at digi.com.br> added the comment:

I think we should add a deprecation warning for those classes in 2.6, 
right?

As we're not removing the whole module, what's the right place to put 
that? On the __init__ method of each class?

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