I receive a msg "the recipient was rejected by the server because the user is unknown" when trying to send an email from me.com to icloud.com. Recipient is in Italy but I have no problem sending to hotmail.com in Italy
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1'user is unknown' is a pretty clear rejection reason. The server doesn't have an account by that name. – Tetsujin Jun 11 '17 at 15:51
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In other words... The first half of the email address is wrong or contains a typo. – Tyson Jun 11 '17 at 16:47
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The error message you received is simple to understand. The email address is invalid.

Marc Wilson
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