Can you recommend an email program that works, unlike eM Client that has caused more aggravation for me than the free version is worth?

I use Powweb as my server…Since early last month, eM Client has become useless. Error upon error upon error…

Kindly recommend another email program, because eM Client is going the way of Ed McMahon sweepstakes mailings.

Could you please tell me what exactly did not work in eM Client?