Github user kevdoran commented on the issue:
https://github.com/apache/nifi/pull/2111
Whoops, didn't see this (or the corresponding JIRA) until after I opened a
ticket and PR for the same issue
([NIFI-4339](https://issues.apache.org/jira/browse/NIFI-4339), [PR
2118](https://github.com/apache/nifi/pull/2118)) after it showed up on
[StackOverflow](https://stackoverflow.com/questions/45927852/nifi-email-consumeimap-filter-by-subject-from-to-and-date/45928680#comment78898203_45928680).
Looks like I accidentally duplicated your effort @btwood, my apologies. I was
able to come up with a test case for the issue, see my branch if interested.
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