--- email-2.5.6/email/Header.py.	2005-06-07 17:47:35 +0400
+++ email-2.5.6/email/Header.py	2005-06-07 17:47:37 +0400
@@ -260,6 +260,9 @@
             charset = self._charset
         elif not isinstance(charset, Charset):
             charset = Charset(charset)
+        # if charset is fail
+        if charset == 'us-ascii' and email.Generator._is8bitstring(s):
+            s = email.quopriMIME.header_encode(s)
         # If the charset is our faux 8bit charset, leave the string unchanged
         if charset <> '8bit':
             # We need to test that the string can be converted to unicode and
--- email-2.5.6/email/base64MIME.py.	2005-06-07 17:47:44 +0400
+++ email-2.5.6/email/base64MIME.py	2005-06-07 17:48:12 +0400
@@ -173,7 +173,7 @@
     if not s:
         return s
 
-    dec = a2b_base64(s)
+    dec = a2b_base64(s + "==")
     if convert_eols:
         return dec.replace(CRLF, convert_eols)
     return dec