Didn't quite work that way, i send a test email from a non MDD account before my server got restored, there was no bounce, no retry, just a single terse 'this is not happening my friend'
This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
xxxxx@myemail.com
host p1.supportedns.com [173.248.191.179]
SMTP error from remote mail server after RCPT TO:<xxxxx@myemail.com>:
550-Please turn on SMTP Authentication in your mail client.
550-sending_host.com [xxx.xxx.xxx.xxx]:34282 is not permitted to relay
550 through this server without authentication.