can't receive certain emails.

Please note that this is Traditional Chinese Q&A Forum, any threads should be posted in Traditional Chinese. However, I will still provide an answer in English based on your initial response. 

Hi Vicky Lynn

I’m sorry you are unable to receive the verification email after already adding the sender and domain to your Safe Senders list.

First, check Junk Email, Deleted Items, the Other tab, mailbox rules, blocked senders, and your available Microsoft storage. Microsoft notes that a full mailbox or cloud storage can prevent new messages from being received, and messages rejected while storage is full cannot be recovered.

If everything looks normal, ask the ticket website to confirm the exact address used to send the verification email and resend it. Also ask its email team to check the sending logs for any bounce, rejection, or delivery error. Adding an address to Safe Senders only affects messages that reach Outlook.com, so it may not resolve a message rejected earlier in the delivery process.

The sender can use Microsoft’s Outlook.com Sender Support guidance. You may also contact Outlook.com support through the Help option in Outlook.com for an account-side review.

Please note that this is a user-to-user support forum. Moderators and contributors, including external Microsoft employees, are not allowed to directly interfere with Microsoft product features or access back-end systems. Our role is limited solely to providing technical guidance on reported incidents, requests, or ideas. 

Thank you for your understanding and have a good day