Github user olegz commented on the issue:
https://github.com/apache/nifi/pull/827
@joewitt @trixpan Just pushed one more commit (un-squashed) with some minor
polishing and few additional tests to validate that SmtpConsumer does not
produce deadlocks due to its synchronous nature while connecting two threads
(SMTPServer and NiFi).
Let me know when I should squash it.
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