Hi, ianb!
Regarding your penultimate post, there are commercial or free programs as Outlook, Thunderbird, and so on, that do the same job by the way of user defined rules.
And about your last one, I agree that Hui is the ultimate (or should I say arcan and dean?) of the Ninjas. But to be fair I should say that all Ninjas here have the skills that the guy, yeah, you know, the one who writes every Bishop's death -spanish dixit-, well, that he as Key Master considered appropriated for holding the honorific badge of Ninja. Maybe you've been more in contact with Hui & me and that leads you to place us a setup up but I assure you that Luke M, NARAYANK991, Faseeh, b(ut)ob(ut)hc, and many members not still Ninjas like XXX, YYY, ..., (you didn't expected me to write their names here, did you?) are more skillful and expert in certain topics than me (I wouldn't dare to add "and Hui").
Thanks for your concepts.
Regards!