Dear Aurélien CLAUDEL,
Thank you for contacting us here in the Microsoft Community.
I'm sorry to hear that you're having problem receiving verification emails from Ubisoft. Don't worry, here are some suggestions.
To better analyze your problem in depth, please don't mind if you're needed to collect and provide more information as follows
- I would like to know what email address you use, is it a Microsoft domain (outlook.com, hotmail.com etc.) or a third-party account (gmail.com, yahoo.com)?
- Have you reviewed your deleted items?
In outlook.com, to confirm that the emails are on the server:
- Check Outlook Web to see if the e-mails are received on the server. You can also use the search box to search for it. If so, it could be due to a sync issue. Go to View>>sync to refresh your mailbox and see if emails are displaying correctly.
- Go to Settings>>Mail>>Rules to see if there are any email rules that will ensure that your emails are deleted immediately.
- Check Settings>>Email>> Forwarding to see if you've enabled email forwarding once they've arrived.
- Make sure your Outlook and OneDrive storage space is full. https://outlook.live.com/mail/0/options/general/storage
If this is the case, follow the storage limits in Outlook.com - Microsoft Support and clean up your mailbox.
If the above suggestions do not solve your problem, the emails may be blocked by the server. The forum agent can't help you directly, can you contact the sender to see if they received a non-delivery report from Outlook? This report is very important to find out the problem.
Click here for Outlook.com support or select Help from the menu bar and enter your question. If self-help doesn't solve your problem, scroll down to Still need help? and select Yes.
My first reaction doesn't always solve your problem, so feel free to contact me to let me know how it goes. I will respond to your question here.
Best wishes
Stan - MSFT | Microsoft Community Support Specialist