11.23 Standard Module mailbox
 
This module defines a number of classes that allow easy and uniform
access to mail messages in a (Unix) mailbox.
- UnixMailbox (fp)
 - 
Access a classic Unix-style mailbox, where all messages are contained
in a single file and separated by ``From name time'' lines.
The file object fp points to the mailbox file.
 
- MmdfMailbox (fp)
 - 
Access an MMDF-style mailbox, where all messages are contained
in a single file and separated by lines consisting of 4 control-A
characters.  The file object fp points to the mailbox file.
 
- MHMailbox (dirname)
 - 
Access an MH mailbox, a directory with each message in a separate
file with a numeric name.
The name of the mailbox directory is passed in dirname.
 
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