Custom SMTP no longer works with google workspace

[tobias.carlbom]

Custom Mail Server Authentication with Google Workspace

I have an App published on a custom domain and am using the Custom Mail Server feature to send emails through Google SMPT (smtp.gmail.com, port 587) using a Google Workspace account. As we know, authentication is done through an email address and password. For authentication to work in this environment, the Workspace sending account’s Security settings must be set to “Allow Less Secure Apps”. According to Google, changes will start happening starting June 15, 2024 and beginning September 30, 20…