As per SDK 1.7.1 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. But these headers are still not getting populated. Any one got success in populating *List-Id* or *List-Unsubscribe* headers using Java SDK 1.7.1 ?
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