Spam
Why I got spam on my mailbox, but address in those spam messages is not my address? Is it bug in iCloud Mail service? It started month ago.
iPhone XR, iOS 15
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No, this is common for all spam. The spammers send an email to hundreds, possibly thousands of people at a time. They use one email address in the “to” line and the balance of hundreds of addresses in the Bcc line.