no mail sent from a while

Hi, we used your great plugin from one year, no problem, but last few days, I cannot remember if we updated it but for sure we update WP and WC to the last version…

Now the plugin doesn’t send mail anymore, just appear the rolling cursor for a few seconds and no mail sent…no error message in the log nothing…. we tried to disable all plugin but same behaviour …

we noticed that previously, when the mail sent, the plugin disaplyed a green message,…now there is no message…

we currently disabled it and change with another, but if you want we can do some tests…

Thanks
Angelo