0.91.4 (Build 261) Works well, but not perfect (on OS X, ElCapitan). I miss cancel and supersedes postings. 'Follow up to:' should be be displayed under the newsgroup line! And it should be possible to create rules with ‘follow up to‘! An translated to other languages, as German too.
The next version will have a FUP indicator as follows:
I'm using a button for this to avoid using extra space in the header area of the GUI.
The other requested features will follow later.
This buttom I use, but I mean to add ‘Follow up to' to a rule
The "Followup-To" header field does not exist in the XOVER header. Usenapp is NOT fetching the full headers, but just the XOVER headers so that rule won't work.