I can't send a message to the iMac using the iCloud server.
I can't send a message to the iMac using the iCloud server. The following message appears: Check the address of the recipient of this message. Check the SMTP server settings in the Mail settings and check additional parameters with the system administrator.
Server response: <unknown[94.127.223.240]>: Client host rejected: Access denied
Select another outgoing mail server from the list below or click "Try later" to leave the message in the Outgoing mailbox until it is sent.
iMac 27″, macOS 12.6