Hello Mohammad, The App Engine Mail API is indeed a deprecated service. The link <https://cloud.google.com/appengine/docs/standard/java/mail> that you have mentioned also contains the following line: *“This solution is no longer recommended: This page describes how to use a legacy App Engine service.”*
However, as I understand, your app is using the Mail API in Java 8 runtime and the issue you are experiencing is its latency (not that the service is not working in Java 8 runtime). Unfortunately, there is no other workaround that we can offer for a deprecated service besides using an alternative solution offered in this <https://cloud.google.com/appengine/docs/standard/java11/java-differences#mail> article of the GCP documentation. -- 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 view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/2af0130b-7991-4911-863f-f79498ba6f6do%40googlegroups.com.
