PutMail: missing Reply-To and unable to honor the attach file mime

This feature regards to minor issues that I've encountered in using Nifi to send emails: being unable of setting a Reply-To address; attaching a file to an email always changes the mime type to application/octet-stream.

1. 1. 1. Reply-to unavailable

The PutMail processor is very useful in order to send email. In some cases, it would be useful to specify a Reply-To address, that is not possible today. It's a very small issue but it has happened to me that it was a major issue in using this processor.

1. 1. 2. Attached file mime always set to application/octet-stream

I've encountered this behaviour numerous times and it usually is not that big of a deal. In some occasions, though, as for as when the file must be classified automatically by a machine, it is very important for the mime type of the attached file to be respected. So I'd like to have an option to forward the actual mime type.