Big email 3.0 API changes, with updated unit tests and documentation.
Briefly (from the NEWS file):

- Updates for the email package:
  + All deprecated APIs that in email 2.x issued warnings have been removed:
    _encoder argument to the MIMEText constructor, Message.add_payload(),
    Utils.dump_address_pair(), Utils.decode(), Utils.encode()
  + New deprecations: Generator.__call__(), Message.get_type(),
    Message.get_main_type(), Message.get_subtype(), the 'strict' argument to
    the Parser constructor.  These will be removed in email 3.1.
  + Support for Python earlier than 2.3 has been removed (see PEP 291).
  + All defect classes have been renamed to end in 'Defect'.
  + Some FeedParser fixes; also a MultipartInvariantViolationDefect will be
    added to messages that claim to be multipart but really aren't.
  + Updates to documentation.
diff --git a/Lib/email/MIMEText.py b/Lib/email/MIMEText.py
index d049ad9..5ef1876 100644
--- a/Lib/email/MIMEText.py
+++ b/Lib/email/MIMEText.py
@@ -1,10 +1,9 @@
-# Copyright (C) 2001,2002 Python Software Foundation
-# Author: barry@zope.com (Barry Warsaw)
+# Copyright (C) 2001-2004 Python Software Foundation
+# Author: Barry Warsaw
+# Contact: email-sig@python.org
 
-"""Class representing text/* type MIME documents.
-"""
+"""Class representing text/* type MIME documents."""
 
-import warnings
 from email.MIMENonMultipart import MIMENonMultipart
 from email.Encoders import encode_7or8bit
 
@@ -13,8 +12,7 @@
 class MIMEText(MIMENonMultipart):
     """Class for generating text/* type MIME documents."""
 
-    def __init__(self, _text, _subtype='plain', _charset='us-ascii',
-                 _encoder=None):
+    def __init__(self, _text, _subtype='plain', _charset='us-ascii'):
         """Create a text/* type MIME document.
 
         _text is the string for this message object.
@@ -24,22 +22,7 @@
         _charset is the character set parameter added to the Content-Type
         header.  This defaults to "us-ascii".  Note that as a side-effect, the
         Content-Transfer-Encoding header will also be set.
-
-        The use of the _encoder is deprecated.  The encoding of the payload,
-        and the setting of the character set parameter now happens implicitly
-        based on the _charset argument.  If _encoder is supplied, then a
-        DeprecationWarning is used, and the _encoder functionality may
-        override any header settings indicated by _charset.  This is probably
-        not what you want.
         """
         MIMENonMultipart.__init__(self, 'text', _subtype,
                                   **{'charset': _charset})
         self.set_payload(_text, _charset)
-        if _encoder is not None:
-            warnings.warn('_encoder argument is obsolete.',
-                          DeprecationWarning, 2)
-            # Because set_payload() with a _charset will set its own
-            # Content-Transfer-Encoding header, we need to delete the
-            # existing one or will end up with two of them. :(
-            del self['content-transfer-encoding']
-            _encoder(self)