Has anybody else experienced something similar, the message is of the form below. Any suggestions where to start? It seems like an issue on the Microsoft side but it happens only for e-mails originating at GAE standard.
Your message wasn't delivered to [email protected] <mailto:[email protected]> because the address couldn't be found. Check for typos or unnecessary spaces and try again. The response from the remote server was: 550 5.5.0 Requested action not taken: mailbox unavailable. or 550 5.7.66 Requested action not taken: mailbox unavailable [HE1EUR02FT020.eop-EUR02.prod.protection.outlook.com <http://eop-eur02.prod.protection.outlook.com/>] -- 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/EEF05F0C-1D9A-44D8-9839-439F16309029%40gae123.com. For more options, visit https://groups.google.com/d/optout.
