Hey Jeff, While in this case, failure of sending was coming from an unexpected direction, prompting engineering action to fix the issue, and leading to our recommendations to run test emails before any campaigns, there does exist a bounce notification feature <https://cloud.google.com/appengine/docs/python/mail/bounce> which can be used to detect the most common email failures. I hope this helps ease your concerns.
Best wishes, Nick Cloud Platform Community Support On Sunday, April 3, 2016 at 12:04:12 PM UTC-4, Jeff Schnitzer wrote: > > On Mon, Mar 28, 2016 at 8:24 AM, Rob Williams <r...@workshoptwelve.com> > wrote: > >> >> The App Engine Mail API is fully featured and fully documented. >> > > > I hate hearing people say things like this. The _bare minimum_ expected of > a service that delivers email is some tracking of whether or not that email > was delivered. If you actually care about whether your customers receive > the email you are sending, you should not be using the App Engine Mail API. > It is not “fully featured”. > > Jeff > -- 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 google-appengine+unsubscr...@googlegroups.com. To post to this group, send email to google-appengine@googlegroups.com. 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/b7c35145-9b6d-48f3-8834-c8b78a31e590%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.