Email notifications are not working with Pro version

I was able to fix it by changing the schedule event directly to the function, for example for new answer:
From this: wp_schedule_single_event( time() + $this->time_delay, ‘dwqa_new_answer_notify’, array($answer_id, $question_id) );

To this one
$this->new_answer_notify($answer_id, $question_id);

Is it OK to change it? will it cause anything?

Thanks,
Oren

At the moment, we have made the DW Q&A will send notify after 2 minutes. If you still can not get the notify after 2minutes or 5minutes, you should send me your FTP account and username & password of your site for further checking.

I understand, but if the change I made works, is it valid to use it like that?

OK I was able to fix the emails when I used a plugin for SMTP (wp-mail-smtp)

Yes, if you have any issue or question, you can let me know. We will help you resolve it.