Specific staff email suddenly stops receiving staff notification email - Order emails

One of staff email suddenly stopped receiving emails from staff notification emails. I could not figure out why and a a support from microsoft tried to help us but mentioned the email wasn’t sent in to that specific email. and to troubleshoot he needs to see any logs that might have evidence that the email has been sent.

I don’t have logs from shopify as well.

and other emails are receiving the emails too.

help?

This problem, where one staff email isn’t receiving notification emails, sounds like a classic case of missing mail. Since Microsoft support couldn’t trace the email and you don’t have Shopify logs, the next crucial step is to examine your email server logs. Depending on your setup, these logs are typically found in locations like /var/log/maillog or /var/log/mail.log on Linux servers, or specific paths for cPanel, Plesk, or Exchange. Look for entries matching the sender and recipient’s email addresses around the expected time of delivery, specifically searching for terms like “rejected,” “deferred,” or “bounced” to identify why the email might not have been delivered.

We did another test today and we tested couple of different emails. this particular email still cannot receive this.
this was the recent logs below. Nathan receives the emails previously but it suddenly stopped.

In the logs, there is no email received or blocked or forwarded. This is the only email that cannot receive notification and other emails has no issues?