Github user trixpan commented on the issue:
https://github.com/apache/nifi/pull/483
@ijokarumawak Still not clear to me how you are reaching the error.
Also, note the QUIT message is not a requirement, a client may chose to
send more than a message per session, example:
```
smtp_connection_reuse_count_limit (0)
When SMTP connection caching is enabled, the number of
times
that an SMTP session may be reused before it is closed, or
zero
(no limit).
```
(Souce: http://www.postfix.org/lmtp.8.html)
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