Thanks very much for your OP, Robert.I successfully installed your share, but had no idea how to use it so I went looking for the original in the hope that it would tell me.
Not only did that solve my ignorance issue, but I also found out that there is an update (to v1.4.3).
I downloaded it and was ready to apply your work-around to make it compatible with Postbox, when I realised that it comes already compatible!
Available from here:
Update to Correct Identity