open
https://gitlab.synchro.net/main/sbbs/-/issues/828
FTS-4 just says "seen-by lines at the end of Conference Mail messages", so we probably should be parsing these even if/when there is no origin line.
--- SBBSecho 3.23-Linux
* Origin: Vertrauen - [vert/cvs/bbs].synchro.net (1:103/705)