The short answer: Use one of the many third-party email solution providers for this, such as SES.
The long answer: I hope you realize this means all your clients must set up SPF records on their domains if you want to have any hope of delivering email on their behalf. If you have nontechnical clients, this is simply not going to work. Jeff 2011/11/24 Ronoaldo José de Lana Pereira <[email protected]> > Dear AppEngine Team, > > We are very happy with AppEngine and we still are using M/S. We can't wait > until we port our app to HRD! > > One big problem for our current busines model is that we have some kind of > a multi-tenant service, and our clients need to send the app notification > e-mails from an account in the client domain (i.e. [email protected]). > Sadly, to do that using AppEngine mail service we have to add > [email protected] at least as an app viewer, and this exposes to whole > datastore to our costumers! > > Is there any way to *whitelist* some e-mails (with proper confirmation) > to be authorized senders of our app? Or do we need to build a third-party > Mail api that uses external servers to be able to send e-mails with any > from/reply-to addresses? > > Any tips on how to have this in a doable, cost-efective and pain-less way > would be very nice :) > > Best regards, > > -Ronoaldo > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > To view this discussion on the web visit > https://groups.google.com/d/msg/google-appengine/-/v62CEFL_33oJ. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/google-appengine?hl=en. > -- I am the 20% -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
