Please add the original incoming mail .eml-File to the attachments selection, so it can be used when answering or forwarding the issue.
This is very helpful when dealing with multiple departments, where all the initial info needs to be forwarded ( and with proper formatting + attachments ).

This feature does already exist, we paid for this as a custom development.
We are okay if this is made available for all customers of RedmineUP.

This is like <20 lines of code, please consider ;) Thanks guys !