How about you create a @gmail.com account for each tenant, and use email 
forwarding/redirection to make it appear to come from the client's account?

On Nov 24, 2011, at 8:26 PM, Ronoaldo José de Lana Pereira wrote:

> 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
> 
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