- Sending a message from a gsuite account user to an external party DOES NOT show the issue
- Sending a message from an internal gsuite account user to another user in the same gsuite account + another user outside of the gsuite account DOES show the issue
- Sending a message from a gsuite account user to another gsuite user in the same account DOES NOT show the issue
- Sending a message from an external account into a gsuite account user DOES SHOW the issue (this might be tied to admin settings in G Suite > Settings for Gmail > Safety - still needs to be tested more)
- The same messages that DO SHOW the issue only show it in Mail.app on macOS & iOS when the gsuite user account is setup as "Google" vs. "IMAP". It DOES NOT show up in the GMAIL iOS app nor does it show up in the gmail.com web interface.
Google support has been effectively useless. Apple support has honestly done more to shed light on the issue. However, both companies are blaming the other and refusing to escalate to engineering or get on a call with the other company to sort this out together. Of course, Google support claims nobody else is reporting this, while Apple support alerted me to this thread. Super frustrating all around. If you are a Gsuite user please report this so I'm not yelling into the wind here. I can also confirm for my account the issue started on October 6, 2020.