Ster, given that you also have problems, it does seem that there have been some breaking changes to email on the platform, beyond simple domain validation failure that I initially assumed. This SO post is related (see the comments):
http://stackoverflow.com/questions/34740906/unable-to-add-an-email-address-from-another-domain-in-gae Although the problem is now resolved for me, it would be nice to get some reassurance that this won't happen again. -- 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/fc8ef710-fe27-4790-b6e6-6cabb66cc958%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
