I know that some members have a problem with receiving emails from this server. I have taken some time today to come up with a simple email testing service for those who wants to confirm cause of issues. Please check out the service tool here: https://www.php-fusion.co.uk/email.php
If there are any issues, please reply to this thread.
To me on the email provider mail.ru did not receive notifications. Yesterday I asked the administrator in my account to replace Yandex mail. Notifications now work.