Hello, I'm running a production app which relies critically on the ability to send emails; it is for example needed for new user signup. This has been working fine, until some time between January 9th and today. Now, when attempting to send an email, I get an error saying "Unauthorized sender".
The application in question is running with increased mail quota; it has billing enabled; and it uses custom domains. The sender email is a user on this custom domain which is configured to have access to the application. The application is written in Java, and uses javax.mail.Transport to send emails. The Transport.send() method now fails with the following error: java.lang.IllegalArgumentException: Unauthorized Sender: Unauthorized sender. I have confirmed that the sender is correct and has access to the application. In fact nothing has changed in the code since January 9th, when this all worked fine, and now (there has been no deployments since December, and there has been no changes to the application configuration in the Google Cloud Console). This is obviously a major problem, and I would greatly appreciate some assistance on the matter ASAP. Thank you, Michael -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/c41bb6b1-16c0-4c71-9a1f-91ac2ce99f18%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
