So, it turns out that server search REALLY DOESN’T WORK.
I had set my message sync (as discussed in another thread: Slow attachments - Mail - eM Client) to “all time,” but recently changed that to “1 year” because my backups were getting too big, and there is no available time period between 1 year and all time.
When I tried to find and email from over a year ago, eMclient returned “no results.” My search options are set to all folders and “use server search” box ticked. I am able to find the emails using my provider’s (private email) web client.
So, what I thought was a functioning server search was actually just a local sync of all my messages, which is no longer practical for space reasons.
Is there a way I can use eMclient to search my server?