Github user trixpan commented on the issue:
https://github.com/apache/nifi/pull/827
@olegz You are clearly confusing envelope (the data exchanged within an
SMTP session) with header information (the data added to the body of the
message after the DATA command).
They don't need to match.
MAIL FROM is an envelope detail it is NOT added to a message. Please refer
back to this comment:
https://github.com/apache/nifi/pull/827#discussion_r74362397
Note how although MAIL FROM was set to a...@aaa.com this information never
makes into the resulting flowfile.
The RCPT TO input makes to it but requires a multiline regex to parse it
and that regex will be quite brittle as resolution will require a IPv4 / IPv6
match, variable domains and so it goes.
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