I'm hoping someone can turn the light on for me here.
When I search in 'Mail' (Mac OSX High Sierra).... 'nothing' happens. I get no results.
I went trawling the net for solutions which pointed me to the Mac inbuilt 'Spotlight' indexing in System Preferences. I tried turning that on and off.
Then I looked in MailHub preferences and found the 'Indexing' Tab with accounts listed.
![Indexing 1] https://imgur.com/a/vMCv0sz
Next to each account, I see a series of folders and one in particular is the 'Inbox' which I can 'toggle' Indexing on or off....
The problem for me, is.... every time I toggle this inbox 'on', MailHub will turn it 'off' again whenever I close or open my Mail program....
So, it appears that I have to do this on each and every account, every time I want to search for something in email. I'm sure that is not the case, but I don't know how to fix it, unless it is a bug?