Yes. This one: E-Mail-Import funktioniert seit dem Update auf DEVONthink Pro 3.9.11 nicht mehr - #3 by cgrunenberg
It’s in German though. What it says is that in DEVONthink 3.9.11 Mail import is broken and the previous version should be installed again for the time being. Christian provides the download link.
If 3.9.12 (or higher) is out already—I can’t say because I’m on a beta—then go for that one.