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] <javascript:>
>
> 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] <javascript:>");
>
> 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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