Hi George, thank you for your answer.
I know the mailing facility is provided, but is limited in the amount of daily recipients. For other projects we used to request to raise such limit. Since this year, GCloud support told us they are not fulfilling new requests for raising such limit anymore. We were told to use a third-party service, like SendGrid, and that's what I did. But the emails we send via such service, though they are DKIM-certified, they are not DMARC-certified. So we thought to send emails to a private SMTP relay that is authenticated as a valid relay for our domain, thus sending emails that are both DKIM and DMARC-certified. Currently, as per your answer, I think the only way we might accomplish this is via sockets. Not so happy to deal with them though. If you have something to add (or to remove) to such idea, it would be great to hear from you. Antonio On Thursday, May 4, 2017 at 4:11:21 PM UTC+2, George (Cloud Platform Support) wrote: > > Hello Antonio, > > Your use case might be viewed by some as seldom occurring: you want to > send email using an external server, when the facility is already provided > in the standard environment, as described in the "Mail API Overview" > on-line document > <https://cloud.google.com/appengine/docs/standard/java/mail/>. > > One might think of sockets, but "Port 25 (SMTP) is blocked" as indicated > in the "Overview of Sockets API for Java" document > <https://cloud.google.com/appengine/docs/standard/java/sockets/>. > -- 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/c503fdcc-be41-4ea3-b9a5-364728c0267d%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
