Github user trixpan commented on the issue:
https://github.com/apache/nifi/pull/827
@olegz have you pushed the notification recently? I got just an abrupt
termination
```
$ telnet 0 2525
Trying 0.0.0.0...
Connected to 0.
Escape character is '^]'.
220 localhost ESMTP Apache NiFi
helo .
250 localhost
mail from: x
250 Ok
rcpt to: y
250 Ok
data
354 End data with <CR><LF>.<CR><LF>
waiting for server to get bored
Connection closed by foreign host.
```
Note the connection close as soon I stop the server
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