Github user trixpan commented on the issue:
https://github.com/apache/nifi/pull/827
@joewitt, @olegz code is a great improvement to the previous code.
I do think the the removal of the maximum message size and timeout checks
should be addressed as soon as possible:
I base my opinion solely on the fact their absence will cause issues to the
clients sending emails/flows via this interface.
As the processor currently lacks the ability to provide the appropriate
SMTP reply codes back to the connecting clients, both ListenSMTP and connecting
MTAs will waste resource every time a a connection times out (I am not 100%
sure how the size issue will unfold).
Postfix documentation describes this scenario:
> smtp_data_done_timeout (default: 600s)
> The Postfix SMTP client time limit for sending the SMTP ".", and for
receiving the remote SMTP server response.
>
> When no response is received within the deadline, a warning is logged
that the mail may be delivered multiple times.
Note the whooping 600s before postfix gives up and disconnect.
Having said that, I am happy to defer this decision to the wider group.
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