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<title>12.4.1 Mailbox Objects
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<H2><A NAME=
"SECTION0014410000000000000000"></A><A NAME=
"mailbox-objects"></A>
All implementations of mailbox objects are iterable objects, and
have one externally visible method. This method is used by iterators
created from mailbox objects and may also be used directly.
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Return the next message in the mailbox, created with the optional
<var>factory
</var> argument passed into the mailbox object's constructor.
By default this is an
<tt class=
"class">rfc822.Message
</tt>
object (see the
<tt class=
"module"><a href=
"module-rfc822.html">rfc822
</a></tt> module). Depending on the mailbox
implementation the
<var>fp
</var> attribute of this object may be a true
file object or a class instance simulating a file object, taking care
of things like message boundaries if multiple mail messages are
contained in a single file, etc. If no more messages are available,
this method returns
<code>None
</code>.
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<span class=
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2.4.2, documentation updated on
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2005.
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