Fixed recipient name decoding

Use decode_headers to decode the recipient name (otherwise it will display something like
=?utf-8?Q?Max_Muster?=)

RewriteGALAddressesToSMTP.py

@@ -6,6 +6,7 @@
 import MAPI
 import email
 from email.utils import getaddresses
+from email.header import decode_header
 
 from MAPI.Util import *
 from plugintemplates import *
@@ -15,6 +16,14 @@ class RewriteGALAddressesToSMTP(IMapiDAgentPlugin):
     def __init__(self, logger):
         IMapiDAgentPlugin.__init__(self, logger)
 
+    def DecodeHeaderToUTF8(self, header):
+        decodedHeader = decode_header(header)
+        headerText, headerEncoding = decodedHeader[0]
+        if headerEncoding is None:
+            return unicode(headerText)
+        else:
+            return unicode(headerText, headerEncoding, 'ignore')
+
     def PreDelivery(self, session, addrbook, store, folder, message):
         headers = message.GetProps([PR_TRANSPORT_MESSAGE_HEADERS], 0)[0].Value
         msg = email.message_from_string(headers)
@@ -25,7 +34,7 @@ class RewriteGALAddressesToSMTP(IMapiDAgentPlugin):
         for addr in to_addrs:
             names.append([
                 SPropValue(PR_RECIPIENT_TYPE, MAPI_TO),
-                SPropValue(PR_DISPLAY_NAME_W, unicode(addr[0])),
+                SPropValue(PR_DISPLAY_NAME_W, self.DecodeHeaderToUTF8(addr[0])),
                 SPropValue(PR_ADDRTYPE, 'SMTP'),
                 SPropValue(PR_EMAIL_ADDRESS, unicode(addr[1])),
             ])
@@ -33,7 +42,7 @@ class RewriteGALAddressesToSMTP(IMapiDAgentPlugin):
         for addr in cc_addrs:
             names.append([
                 SPropValue(PR_RECIPIENT_TYPE, MAPI_CC),
-                SPropValue(PR_DISPLAY_NAME_W, unicode(addr[0])),
+                SPropValue(PR_DISPLAY_NAME_W, self.DecodeHeaderToUTF8(addr[0])),
                 SPropValue(PR_ADDRTYPE, 'SMTP'),
                 SPropValue(PR_EMAIL_ADDRESS, unicode(addr[1])),
             ])