To whom still struggling with this problem, I have got an answer from EM plugin page.
As far as I’m aware, the plugin should still work, however we have already fixed this in our local codebase and the fix should be out in the next update, which I hope will happen by next week, we may well release a dev version of the plugin even today to address some other issues.
Another alternative is switching to WP Mail so that mails go via WP Mail SMTP, temporarily.
Best Regards,
