iCloud mail 550 User unknown (in reply to RCPT TO command)

Whenever I receive a mail in my iCloud account I get another undelivered mail message "550 User unknown (in reply to RCPT TO command)" from an old email address that is no longer in use. I have deleted this account and removed it from the SMTP server list, but the replies still come in. Any ideas on how to stop this happening?

MacBook Pro 13″

Posted on Aug 9, 2023 7:19 AM

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iCloud mail 550 User unknown (in reply to RCPT TO command)

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