My bizarre email issue is about gmail, not iCloud, but I'm hoping someone clueful can weigh in.
In my gmail inbox I periodically get very strange emails from mailer-daemon@googlemail.com, addressed to username+caf_=username=example.com@gmail.com
(where "username" is my gmail user, and "example.com" is the domain of a consulting client from a decade ago that gave me username@example.com)
The body of these weird messages says
Address not found
Your message wasn't delivered to username@example.com because the address couldn't be found, or is unable to receive mail.
550 5.1.1
The email account that you tried to reach does not exist. Please try double-checking the recipient's email address for typos or unnecessary spaces. For more information, go to https://support.google.com/mail/?p=NoSuchUser 6a1803df08f44-6ac070f1538sor47269616d6.5 - gsmtp
above an arbitrary supposedly-forwarded message like
---------- Forwarded message ----------
From: The New Yorker Daily <newyorker@newsletter.newyorker.com>
To: username@gmail.com
Cc:
Bcc:
Date: Tue, 28 May 2024 16:31:02 -0400 (EDT)
Subject: The Secrets of the Stasi
----- Message truncated -----
