Yep, I've got the reason for the failed sent messages:
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:
<number>@orange.net
SMTP error from remote mail server after RCPT TO:<number>@orange.net:
host mail-in.freeserve.com [193.252.22.142]: 550 5.7.1 <number>@orange.net:
Recipient address rejected: User unknown
So, where do we go from there?
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