Github user btwood commented on the issue:

    https://github.com/apache/nifi/pull/2111
  
    This is done.
    
    This PR does the following:
    - Handles the Null Pointer Exception when parsing email addresses (lack of 
address will not cause the Processors to fail)
    - Adds the "Use Strict Address Parsing" Property to the ExtractEmailHeaders 
Processor to allow the user to tune the strictness of email address parsing
    - Relaxes the strict email address requirement on the 
ExtractEmailAttachments Processor (from email doesn't need to be valid and is 
not used in the internal logic of the Processor)
    - Adds unit tests for non-strict address parsing
    - Fixes GennerateAttachment.java to return the correct value
    
    Submitting this for review and merge.


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