diff -r a7e0a1dbfbb6 Doc/library/email.util.rst
--- a/Doc/library/email.util.rst	Sun Mar 27 10:15:57 2011 +0200
+++ b/Doc/library/email.util.rst	Sun Mar 27 23:45:00 2011 +0200
@@ -29,13 +29,17 @@
    fails, in which case a 2-tuple of ``('', '')`` is returned.
 
 
-.. function:: formataddr(pair)
+.. function:: formataddr(pair, charset='utf-8')
 
    The inverse of :meth:`parseaddr`, this takes a 2-tuple of the form ``(realname,
    email_address)`` and returns the string value suitable for a :mailheader:`To` or
    :mailheader:`Cc` header.  If the first element of *pair* is false, then the
    second element is returned unmodified.
 
+   Optional *charset* if given this is the character set that is used to encode
+   ``realname`` in case ``realname`` is not ascii safe.  Can be an instance of
+   :class:`str` or :class:`Charset`.
+
 
 .. function:: getaddresses(fieldvalues)
 
diff -r a7e0a1dbfbb6 Lib/email/utils.py
--- a/Lib/email/utils.py	Sun Mar 27 10:15:57 2011 +0200
+++ b/Lib/email/utils.py	Sun Mar 27 23:45:00 2011 +0200
@@ -42,6 +42,7 @@
 
 # Intrapackage imports
 from email.encoders import _bencode, _qencode
+from email.charset import Charset
 
 COMMASPACE = ', '
 EMPTYSTRING = ''
@@ -56,21 +57,35 @@
 
 # Helpers
 
-def formataddr(pair):
+def formataddr(pair, charset='utf-8'):
     """The inverse of parseaddr(), this takes a 2-tuple of the form
     (realname, email_address) and returns the string value suitable
     for an RFC 2822 From, To or Cc header.
 
     If the first element of pair is false, then the second element is
     returned unmodified.
+
+    Optional charset if given this is the character set that is used
+    to encode realname in case realname is not ascii safe.  Can be an
+    instance of str or Charset.
     """
     name, address = pair
+    # Will throw UnicodeEncodeError when address is not plain ascii:
+    address.encode('ascii')
     if name:
-        quotes = ''
-        if specialsre.search(name):
-            quotes = '"'
-        name = escapesre.sub(r'\\\g<0>', name)
-        return '%s%s%s <%s>' % (quotes, name, quotes, address)
+        try:
+            name.encode('ascii')
+        except UnicodeEncodeError:
+            if not isinstance(charset, Charset):
+                charset = Charset(charset)
+            encoded_name = charset.header_encode(name)
+            return "%s <%s>" % (encoded_name, address)
+        else:
+            quotes = ''
+            if specialsre.search(name):
+                quotes = '"'
+            name = escapesre.sub(r'\\\g<0>', name)
+            return '%s%s%s <%s>' % (quotes, name, quotes, address)
     return address
 
 
diff -r a7e0a1dbfbb6 Lib/test/test_email/test_email.py
--- a/Lib/test/test_email/test_email.py	Sun Mar 27 10:15:57 2011 +0200
+++ b/Lib/test/test_email/test_email.py	Sun Mar 27 23:45:00 2011 +0200
@@ -2408,6 +2408,24 @@
         b = 'person@dom.ain'
         self.assertEqual(utils.parseaddr(utils.formataddr((a, b))), (a, b))
 
+    def test_quotes_unicode_names(self):
+        # issue 1690608.  email.utils.formataddr() should be rfc2047 aware.
+        name = "H\u00e4ns W\u00fcrst"
+        addr = 'person@dom.ain'
+        utf8_base64 = "=?utf-8?b?SMOkbnMgV8O8cnN0?= <person@dom.ain>"
+        latin1_quopri = "=?iso-8859-1?q?H=E4ns_W=FCrst?= <person@dom.ain>"
+        self.assertEqual(utils.formataddr((name, addr)), utf8_base64)
+        self.assertEqual(utils.formataddr((name, addr), 'iso-8859-1'),
+            latin1_quopri)
+        self.assertEqual(utils.formataddr((name, addr), Charset('utf-8')),
+            utf8_base64)
+
+    def test_unicode_address_raises_error(self):
+        # issue 1690608.  email.utils.formataddr() should be rfc2047 aware.
+        addr = 'pers\u00f6n@dom.in'
+        self.assertRaises(UnicodeError, utils.formataddr, (None, addr))
+        self.assertRaises(UnicodeError, utils.formataddr, ("Name", addr))
+
     def test_name_with_dot(self):
         x = 'John X. Doe <jxd@example.com>'
         y = '"John X. Doe" <jxd@example.com>'
diff -r a7e0a1dbfbb6 Misc/ACKS
--- a/Misc/ACKS	Sun Mar 27 10:15:57 2011 +0200
+++ b/Misc/ACKS	Sun Mar 27 23:45:00 2011 +0200
@@ -977,3 +977,4 @@
 Kai Zhu
 Tarek Ziadé
 Peter Åstrand
+Torsten Becker