Dear TSMC,
I am an independent advisor, and I am trying to help other users in Community with my experience in Microsoft products.
Could you be more precise tith what do you mean by "Is there a possible duplicate email address for overseas Hotmail with a different suffix"? Those emails are probably scam, you can hoover over the links to check , but no click them.
There are couple of ways to deal with scammers and unwanted emails.
First of all check your spam filters and see suggestions on how to keep spam out of your inbox
https://support.office.com/en-us/article/help-k...
Report the phishing, spam and unwanted emails
https://support.office.com/en-us/article/deal-w...
Add emails or domains to block sender list
https://support.office.com/en-us/article/block-...
Also read this information about fighting junk emails
https://sendersupport.olc.protection.outlook.co...
Hope this will help your email free from Junk!
Looking forward to your reply.