I'm running 4.1.5 on Win 10 Pro and email notifications were working a few days ago, but have now stopped. I am using an ISP type SMTP account (not Gmail etc.), the account can send and receive without issues. It seems the issue is with qBitorrent nlot sending/authenticatin but I can't verify that easily without queuing downloads.
There is no 'Test' button on the Tools > Options > Downloads Is there anyway to test/force sending emails from qBittorrent without waiting for downloads to complete?