Redmine

Dear all,
Since Redmine 4.x has not sent an email notification to a group of the recipient but send a separate email to each recipient so the users who almost work with Redmine issue via email hard to know who will receive their update.
I am looking for 1 of the below solutions:

1. Make changes to Redmine to make it send email to a group of the recipient like the old days
2. Modify the email notification template to include a line that lists all the email recipient

Thank you!
Tuan