Once the system is open on your server, please follow the below steps to make the changes.
Select
Tools >> Plug-ins >> Email Notification:
The Email notification settings window will open which will allow
you to make changes to the SMTP Settings:
After making changes on the SMTP Settings you
may click on the “Test” button to see if the settings are correct.
Once the settings are correct, you may then
click on the ‘Ok’ button to apply the changes that have been made.