Issue was with Java Mail API, using low level APIs I was able to populate 
new permitted headers.
Thanks for reply.

On Wednesday, September 12, 2012 11:04:35 PM UTC+5:30, someone1 wrote:
>
> Not entirely sure if this will fix it, but List-Unsubscribe should be a 
> URL format:
>
> *mailto:[email protected]* not just [email protected]
>
> You can include multiple ways to unsubscribe to (mailto: as well as 
> http://)
>
> List-Unsubscribe: 
> <mailto:<identifying_key>@<app_id>.appspotmail.com>,<http://[url_to_unsubscribe_to]>
>
>
> Hope this helps!
>
>
> -Prateek
>
>
> On Wednesday, September 12, 2012 10:32:04 AM UTC-4, AmitAlone wrote:
>>
>> As mentioned in the release notes 
>>
>> - The Mail API now supports the following headers for outgoing mail: 
>> List-Id,  List-Unsubscribe, On-Behalf-Of, Resent-Date, Resent-From, Resent-To
>> I tried to to add two headers for test run, here are the populated headers 
>> in the log.
>>
>> List-Id: mylistid677 
>> List-Unsubscribe: [email protected]
>>
>> However when I checked email source there were no such headers populated. I 
>> am using JAVA SDK 1.7.1
>>
>> Please find the code for same.
>>
>>  msg.setHeader("List-Id", "mylistid677");
>>  msg.setHeader("List-Unsubscribe", "[email protected]");
>>
>> What am I missing in code or application setting ? Or these headers are 
>> still not supported ?
>> On Wednesday, August 8, 2012 11:27:54 PM UTC+5:30, Marce (Google) wrote:
>>>
>>> Hi,
>>>
>>> We've just posted the pre-release SDKs for Python and Java here:
>>> http://code.google.com/p/googleappengine/downloads/list
>>>
>>> Release notes below.
>>>
>>> Cheers,
>>> Marzia
>>>
>>> App Engine Java SDK - Release NotesVersion 1.7.1=============- The URLFetch 
>>> API now supports multiple cookie headers.    
>>> http://code.google.com/p/googleappengine/issues/detail?id=3379 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D3379&usg=AFQjCNGmMC_rdHesW_2aGQpFJYrpuhU6WA>-
>>>  You can download 90 days worth of Usage Reports for your application from 
>>> the  Billing History page of the Admin Console.- Task Queue requests now 
>>> include an X-AppEngine-TaskExecutionCount that counts  the number of times 
>>> a task was run by an instance.- Added support for delete() to the Files 
>>> API.- Added support for multiple files to be deleted using the Files API.- 
>>> Added support to delete files from Google Cloud Storage using the Files 
>>> API.- Added a REQUEST_LOG_ID to be written in the logs and as an  
>>> ApiProxy.Environment attribute. This can be used to later identifying that  
>>> request in the application logs.- The Memcache Viewer now supports 
>>> namespaces.    
>>> http://code.google.com/p/googleappengine/issues/detail?id=7245 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D7245&usg=AFQjCNHLF4TbAjowkpD30Vv1WeedSF8fNQ>-
>>>  The Mail API now supports the following headers for outgoing mail: 
>>> List-Id,  List-Unsubscribe, On-Behalf-Of, Resent-Date, Resent-From, 
>>> Resent-To.    
>>> http://code.google.com/p/googleappengine/issues/detail?id=2559 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D2559&usg=AFQjCNGkfYOxsryN2URgym-bM95SzSzY5A>
>>>     http://code.google.com/p/googleappengine/issues/detail?id=7672 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D7672&usg=AFQjCNEiNLuhDHmbptGbtNNqGuHLXAfCVg>-
>>>  Version 2 of the DataNucleus plugin has been upgraded and is now fully  
>>> supported. For a full list of improvements please see    
>>> http://code.google.com/p/datanucleus-appengine/source/browse/branches/2_1_0/dist/RELEASE_NOTES.ORM
>>>  
>>> <http://www.google.com/url?q=http://code.google.com/p/datanucleus-appengine/source/browse/branches/2_1_0/dist/RELEASE_NOTES.ORM&usg=AFQjCNGuSieUqsa1x4Oo_E41WONDPE6-sw>-
>>>  The Search API now supports default values for dates in SortExpressions.- 
>>> The .project and .classpath files are now included in the App Engine demos  
>>> so that they may be imported by Eclipse.- Fixed an issue with the App 
>>> Engine satisfaction survey in the Admin Console  which was released in 
>>> 1.6.6, which will be re-enabled in this release.- Fixed an issue where 
>>> ListIndexes failed when trying to return a schema that  contained Geo 
>>> fields.- Fixed an issue with Search API websafe cursors not being returned 
>>> as a  websafe value.- Fixed an issue where Java's AsyncMemcacheServiceImpl 
>>> was incorrectly throwing  MemcacheServiceException.    
>>> http://code.google.com/p/googleappengine/issues/detail?id=6236 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D6236&usg=AFQjCNF2MoPaIbrPA4v3jw_1RDWnmIHBCQ>-
>>>  Fixed a Memcache error when getting HttpSession.    
>>> http://code.google.com/p/googleappengine/issues/detail?id=6463 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D6463&usg=AFQjCNHHXE0yoIvT2Ebankiah6JFFfWkYg>-
>>>  Fixed a search issue where snippets failed to highlight when a capital  
>>> letter is used in a search term.    
>>> http://code.google.com/p/googleappengine/issues/detail?id=7665 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D7665&usg=AFQjCNG1w2dqWb4m7lCZfm673pDXWUW22w>-
>>>  Fixed an issue where JDO and JPA keys-only queries were being executed as  
>>> full entity queries in the datastore.    
>>> http://code.google.com/p/googleappengine/issues/detail?id=7712 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D7712&usg=AFQjCNGNYu2C5bs8LrrdNZVdk9d6ezl91Q>-
>>>  Fixed an issue where traffic splitting by cookie was not working.    
>>> http://code.google.com/p/googleappengine/issues/detail?id=7813 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D7813&usg=AFQjCNHW3qohz7ewF4IQ6WHvkGpvTbRP5Q>
>>>
>>> App Engine Python SDK - Release NotesVersion 
>>> 1.7.1===============================- The URLFetch API now supports 
>>> multiple cookie headers.    
>>> http://code.google.com/p/googleappengine/issues/detail?id=3379 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D3379&usg=AFQjCNGmMC_rdHesW_2aGQpFJYrpuhU6WA>-
>>>  You can download 90 days worth of Usage Reports for your application from 
>>> the  Billing History page of the Admin Console.- Task Queue requests now 
>>> include an X-AppEngine-TaskExecutionCount that counts  the number of times 
>>> a task was run by an instance.- Added support for multiple files to be 
>>> deleted using the Files API.- Added support to delete files from Google 
>>> Cloud Storage using the Files API.- Added a REQUEST_LOG_ID to be written in 
>>> the logs and as an environment  variable. This can be used to later 
>>> identifying that request in the  application logs.- The Memcache Viewer now 
>>> supports namespaces.    
>>> http://code.google.com/p/googleappengine/issues/detail?id=7245 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D7245&usg=AFQjCNHLF4TbAjowkpD30Vv1WeedSF8fNQ>-
>>>  The Mail API now supports the following headers for outgoing mail: 
>>> List-Id,  List-Unsubscribe, On-Behalf-Of, Resent-Date, Resent-From, 
>>> Resent-To.    
>>> http://code.google.com/p/googleappengine/issues/detail?id=2559 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D2559&usg=AFQjCNGkfYOxsryN2URgym-bM95SzSzY5A>
>>>     http://code.google.com/p/googleappengine/issues/detail?id=7672 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D7672&usg=AFQjCNEiNLuhDHmbptGbtNNqGuHLXAfCVg>-
>>>  PyCrypto 2.6. is now supported in the Python 2.7 runtime.    
>>> http://code.google.com/p/googleappengine/issues/detail?id=7884 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D7884&usg=AFQjCNGgdEPPAc5A9Hvu6c-tKTxR7YP-vg>-
>>>  NDB now throws a BadProjectionError when trying to perform a projection 
>>> query  on an unknown or unindexed property.- NDB Tasklets use the namespace 
>>> from when it was called, not the namespace from  when it is performed.    
>>> http://code.google.com/p/appengine-ndb-experiment/issues/detail?id=190 
>>> <http://www.google.com/url?q=http://code.google.com/p/appengine-ndb-experiment/issues/detail%3Fid%3D190&usg=AFQjCNFetpQJgYxLwXZzoPP3E7SnQIuYMw>-
>>>  NDB Properties' string representation size is limited to the max string  
>>> length for Blob and Text properties.- Appstats provides an interactive 
>>> shell for observing RPC behavior of calls  immediately.- Appstats now 
>>> contains information about the cost of the RPCs made during the  request.- 
>>> The Images API now supports specifying the default pixel color to fill in 
>>> for  image types that don't support transparent images, such as JPEG.- 
>>> We've added full asynchronous API support in the Images API.- Added an 
>>> error to the Images API to indicate when a blob being referenced is  not 
>>> found or not accessible.- Made the Python search limits public in the 
>>> Search API.- Added namespace support for the Search API in the Python SDK.  
>>>   http://code.google.com/p/googleappengine/issues/detail?id=7670 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D7670&usg=AFQjCNHQ87Gp4wRbJr92yXo3c98B54xglw>-
>>>  Added support in the Search API for simple sorting in the SDK.    
>>> http://code.google.com/p/googleappengine/issues/detail?id=7456 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D7456&usg=AFQjCNHr5XQ9qirVwEBzUAwUJ5bSdnpO1w>-
>>>  The Testbed testing framework now supports the Logservice API.- Added 
>>> support in the Files API to list Google Cloud Storage files.- Improve the 
>>> MapReduce File API Reader to support multiple files and file  formats.- 
>>> Fixed an issue with the App Engine satisfaction survey in the Admin Console 
>>>  which was released in 1.6.6, which will be re-enabled in this release.- 
>>> Fixed an issue with Search API websafe cursors not being returned as a  
>>> websafe value.- Fixed an issue where SearchRequest was returning errors 
>>> that weren't  available as search.Error subclasses.- Fixed an NDB issue 
>>> where entities over 1000000 bytes where written to  memcache, causing 
>>> failure.    
>>> http://code.google.com/p/appengine-ndb-experiment/issues/detail?id=193 
>>> <http://www.google.com/url?q=http://code.google.com/p/appengine-ndb-experiment/issues/detail%3Fid%3D193&usg=AFQjCNFF2GPNISYEFXZCqiho02PvnVQUEg>-
>>>  Fixed NDB AutoBatcher error handling.    
>>> http://code.google.com/p/appengine-ndb-experiment/issues/detail?id=196 
>>> <http://www.google.com/url?q=http://code.google.com/p/appengine-ndb-experiment/issues/detail%3Fid%3D196&usg=AFQjCNHy60NjEGrR0klhEgeYWUkpT_epKQ>-
>>>  Fixed an issue where Appstats assuming all objects have a __class__ 
>>> attribute  resulted in an error.    
>>> http://code.google.com/p/googleappengine/issues/detail?id=5668 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D5668&usg=AFQjCNFm0hMzWQOpkL6QRF5eBfHs0scucA>-
>>>  Fixed an issue where there was unbalanced string quoting in Appstats  
>>> formatting.    
>>> http://code.google.com/p/googleappengine/issues/detail?id=5976 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D5976&usg=AFQjCNE3L_3m0R6SCRKqBpCL1qa8ZRF_hw>-
>>>  Fixed an issue where search indexes were not persisted in the SDK.    
>>> http://code.google.com/p/googleappengine/issues/detail?id=6791 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D6791&usg=AFQjCNH0_i65wi0eqJALbUgMm_rGZARfmA>-
>>>  Fixed an issue where an error in formatter.py in Appstats was being 
>>> thrown.    http://code.google.com/p/googleappengine/issues/detail?id=7034 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D7034&usg=AFQjCNFMnmmlHHom2PZdMCPVjOgpTX-rDQ>-
>>>  Fixed an issue in the SDK where the Search API did not support boolean 
>>> queries  on a field.    
>>> http://code.google.com/p/googleappengine/issues/detail?id=7247 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D7247&usg=AFQjCNGLiHTXS3xDKiKwHF3Xb0gZ_zc6-A>-
>>>  Fixed an issue where numeric and date comparators were not supported in 
>>> the  Search API in the Python SDK.    
>>> http://code.google.com/p/googleappengine/issues/detail?id=7247 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D7247&usg=AFQjCNGLiHTXS3xDKiKwHF3Xb0gZ_zc6-A>-
>>>  Fixed an issue where Appstats didn't show a detailed view of an RPC when 
>>> using  the Python 2.7 runtime.    
>>> http://code.google.com/p/googleappengine/issues/detail?id=7558 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D7558&usg=AFQjCNH5RLMpxCN1lT8Db_K6nTJTEGGHTQ>-
>>>  Fixed a search issue where snippets failed to highlight when a capital 
>>> letter  is used in a search term.    
>>> http://code.google.com/p/googleappengine/issues/detail?id=7665 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D7665&usg=AFQjCNG1w2dqWb4m7lCZfm673pDXWUW22w>-
>>>  Fixed an issue where the SDK Admin tool couldn't browse search indexes  
>>> containing unicode characters.    
>>> http://code.google.com/p/googleappengine/issues/detail?id=7791 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D7791&usg=AFQjCNFwOm2D27G0d7nFxx9NY5S-Z8ZmkQ>-
>>>  Fixed an issue where traffic splitting by cookie was not working.    
>>> http://code.google.com/p/googleappengine/issues/detail?id=7813 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D7813&usg=AFQjCNHW3qohz7ewF4IQ6WHvkGpvTbRP5Q>-
>>>  Fixed an issue where RequestTooLargeError was being incorrectly thrown 
>>> using  Python 2.7.    
>>> http://code.google.com/p/googleappengine/issues/detail?id=7820 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D7820&usg=AFQjCNFe3ZmoMQPkt1ZptSLiiIpFSnTl4Q>-
>>>  Fixed a memcache race condition.    
>>> http://code.google.com/p/googleappengine/issues/detail?id=7864 
>>> <http://www.google.com/url?q=http://code.google.com/p/googleappengine/issues/detail%3Fid%3D7864&usg=AFQjCNErrtLaHymQXTf91Qb5LQdd8Qyz9A>
>>>
>>>  
>>>

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