Fix lots of broken links in the docs, found by Sphinx' external link checker.
diff --git a/Doc/library/mailbox.rst b/Doc/library/mailbox.rst
index c918953..7cc2923 100644
--- a/Doc/library/mailbox.rst
+++ b/Doc/library/mailbox.rst
@@ -404,7 +404,7 @@
Notes on Maildir by its inventor. Includes an updated name-creation scheme and
details on "info" semantics.
- `maildir man page from Courier <http://www.courier-mta.org/?maildir.html>`_
+ `maildir man page from Courier <http://www.courier-mta.org/maildir.html>`_
Another specification of the format. Describes a common extension for supporting
folders.
@@ -461,7 +461,7 @@
`mbox man page from tin <http://www.tin.org/bin/man.cgi?section=5&topic=mbox>`_
Another specification of the format, with details on locking.
- `Configuring Netscape Mail on Unix: Why The Content-Length Format is Bad <http://home.netscape.com/eng/mozilla/2.0/relnotes/demo/content-length.html>`_
+ `Configuring Netscape Mail on Unix: Why The Content-Length Format is Bad <http://www.jwz.org/doc/content-length.html>`_
An argument for using the original mbox format rather than a variation.
`"mbox" is a family of several mutually incompatible mailbox formats <http://homepages.tesco.net./~J.deBoynePollard/FGA/mail-mbox-formats.html>`_
@@ -665,7 +665,7 @@
`Format of Version 5 Babyl Files <http://quimby.gnus.org/notes/BABYL>`_
A specification of the Babyl format.
- `Reading Mail with Rmail <http://www.gnu.org/software/emacs/manual/html_node/Rmail.html>`_
+ `Reading Mail with Rmail <http://www.gnu.org/software/emacs/manual/html_node/emacs/Rmail.html>`_
The Rmail manual, with some information on Babyl semantics.
@@ -1541,10 +1541,6 @@
:class:`UnixMailbox` except that individual messages are separated by only
``From`` lines.
- For more information, see `Configuring Netscape Mail on Unix: Why the
- Content-Length Format is Bad
- <http://home.netscape.com/eng/mozilla/2.0/relnotes/demo/content-length.html>`_.
-
.. class:: PortableUnixMailbox(fp[, factory])