sending emails as a particular Google Workspace user from Moodle

My reply to a query about a Moodle instance sending emails with a professor's email id instead of a generic address, and how to change it - 

1. Please try logging on to the-desired-email@ourdomain.tld on your browser, see if there is some issue with the username and password.

2. As you know, on moodle, you have to set up the outgoing email configuration with that username and pw at

Site administration > Server > Email > Outgoing mail configuration.

3. The sending of emails has to be authenticated and set up

https://support.google.com/a/answer/176600

4. Why the professor's account works and not the-desired-email account - probably because the professor's account has SMTP enabled from earlier. 

You could please do the setup for (3.) using the recommended option, using smtp-relay.gmail.com