Tangentially, while not a bounce-after-accept, one user has been seeing
this 5.7.1 NDR when emailing a contact's GSuite account. It does seem
similar to an organisational bounce or incorrectly configured forward,
frankly I'm not sure what to make of it. Typically you can't reach a
Workspace support agent unless you're the admin user.

<u...@host.domain.tld>: host aspmx.l.google.com[74.125.133.27] said:
    550-5.7.1 Please be advised that your email account is not configured to
    send to 550 5.7.1 this email address, therefore your message has not
been
    sent - gcdp a184si2242425wmh.22 - gsmtp (in reply to end of DATA
command)

I can find zero information about what triggers this specific response.
Anyone seen behaviour like this recently?
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