I have a problem, which I don't know if it's related.
Alibaba SMTP offers port 25, 465 and 80; using SMTP testers they all work for me, but in mailwizz I've only managed to get port 80 to work. (It only happens to me with Alibaba SMTP, because with other providers all ports work without problems, and if I use the other ports in online SMTP testers the Alibaba ones work),
If I use port 25 or 465, the page takes a long time to load and then crashes (Gateway time-out )