How to send email from alias with OAuth 2.0

Hello,    We started a new Mendix project and need to send emails from an alias. Usually we implemented the email template module, and where able to send emails from an alias over SMPT using basic authentication.  However this basic authentication is deprecated and soon will only be working with OAuth, so for the new project we figured to implemented the email connector module.  Since we only have an alias and not an email account we cannot send emails any longer from that alias when using OAuth.  Does anyone ran into the same problem and has a solution for that? 
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