I am using email function configured by using Gmail smtp so far so good until recent Google announced “Less Secure App Access” option was no longer available. I set the Less Secure App Access to ON and enable IMAP previously. Now you can see from the below image that suddenly Gmail reject Rapid SCADA to access my google account.
As I understand, Google does not allow 3rd party application to send emails any more.
You should use another email service.
For example, in my country https://yandex.com is popular.
Mail servers may use various server host and port, different than Google. Check their manuals.
This reply was modified 2 weeks, 3 days ago by Mikhail.