| \section{Standard Module \sectcode{mailbox}} | 
 | \stmodindex{mailbox} | 
 |  | 
 | \renewcommand{\indexsubitem}{(in module mailbox)} | 
 |  | 
 | This module defines a number of classes that allow easy and uniform | 
 | access to mail messages in a (unix) mailbox. | 
 |  | 
 | \begin{funcdesc}{UnixMailbox}{fp} | 
 | Access a classic unix-style mailbox, where all messages are contained | 
 | in a single file and separated by ``From name time'' lines. \var{Fp} | 
 | is the file object pointing to the mailbox file. | 
 | \end{funcdesc} | 
 |  | 
 | \begin{funcdesc}{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. \var{Fp} | 
 | is the file object pointing to the mailbox file. | 
 | \end{funcdesc} | 
 |  | 
 | \begin{funcdesc}{MHMailbox}{dirname} | 
 | Access an MH mailbox, a directory with each message in a separate | 
 | file with a numeric name. \var{Dirname} | 
 | is the name of the mailbox directory. | 
 | \end{funcdesc} | 
 |  | 
 | \subsection{Mailbox Objects} | 
 |  | 
 | All implementations of Mailbox objects have one externally visible | 
 | method: | 
 |  | 
 | \begin{funcdesc}{next}{} | 
 | Return the next message in the mailbox, as a \code{rfc822.Message} object= | 
 | =2E | 
 | Depending on the mailbox implementation the \var{fp} attribute of this | 
 | object may be a true file object or a class instance simulating a file ob= | 
 | ject, | 
 | taking care of things like message boundaries if multiple mail messages a= | 
 | re | 
 | contained in a single file, etc. | 
 | \end{funcdesc} |