diff -r a82d7e028458 Doc/library/poplib.rst
--- a/Doc/library/poplib.rst	Mon Jun 16 19:26:56 2014 -0400
+++ b/Doc/library/poplib.rst	Wed Jul 02 03:23:54 2014 +0200
@@ -194,6 +194,15 @@
    the unique id for that message in the form ``'response mesgnum uid``, otherwise
    result is list ``(response, ['mesgnum uid', ...], octets)``.
 
+
+.. method:: POP3.utf8()
+
+   Try to switch to UTF-8 mode. Returns the server response if sucessful,
+   raises :class:`error_proto` if not. Specified in :RFC:`6856`.
+
+   .. versionadded:: 3.5
+
+
 .. method:: POP3.stls(context=None)
 
    Start a TLS session on the active connection as specified in :rfc:`2595`.
diff -r a82d7e028458 Lib/poplib.py
--- a/Lib/poplib.py	Mon Jun 16 19:26:56 2014 -0400
+++ b/Lib/poplib.py	Wed Jul 02 03:23:54 2014 +0200
@@ -71,6 +71,7 @@
             UIDL [msg]              uidl(msg = None)
             CAPA                    capa()
             STLS                    stls()
+            UTF8                    utf8()
 
     Raises one exception: 'error_proto'.
 
@@ -343,6 +344,12 @@
         return self._longcmd('UIDL')
 
 
+    def utf8(self):
+        """Try to enter UTF-8 mode (see RFC 6856). Returns server response.
+        """
+        return self._shortcmd('UTF8')
+
+
     def capa(self):
         """Return server capabilities (RFC 2449) as a dictionary
         >>> c=poplib.POP3('localhost')
diff -r a82d7e028458 Lib/test/test_poplib.py
--- a/Lib/test/test_poplib.py	Mon Jun 16 19:26:56 2014 -0400
+++ b/Lib/test/test_poplib.py	Wed Jul 02 03:23:54 2014 +0200
@@ -47,6 +47,7 @@
 class DummyPOP3Handler(asynchat.async_chat):
 
     CAPAS = {'UIDL': [], 'IMPLEMENTATION': ['python-testlib-pop-server']}
+    enable_UTF8 = False
 
     def __init__(self, conn):
         asynchat.async_chat.__init__(self, conn)
@@ -145,6 +146,11 @@
                 self.push(' '.join(_ln))
         self.push('.')
 
+    def cmd_utf8(self, arg):
+        self.push('+OK I know RFC6856'
+                  if self.enable_UTF8
+                  else '-ERR What is UTF8?!')
+
     if SUPPORTS_SSL:
 
         def cmd_stls(self, arg):
@@ -312,6 +318,16 @@
         self.client.uidl()
         self.client.uidl('foo')
 
+    def test_utf8_raises_if_unsupported(self):
+        self.server.handler.enable_UTF8 = False
+        self.assertRaises(poplib.error_proto, self.client.utf8)
+
+    def test_utf8(self):
+        self.server.handler.enable_UTF8 = True
+        expected = b'+OK I know RFC6856'
+        result = self.client.utf8()
+        self.assertEqual(result, expected)
+
     def test_capa(self):
         capa = self.client.capa()
         self.assertTrue('IMPLEMENTATION' in capa.keys())