Using the New Outlook for Mac for personal email and calendar
Hi,
I’m Dyari. Thanks for reaching out.
I cannot directly check Microsoft’s server logs to confirm whether these messages were rejected. Please sign in to Outlook.com in a browser https://outlook.live.com/mail/ and search all folders, including Junk Email, Deleted Items, and Archive.
Then, go to Settings > Mail > Junk email. Remove ameli.fr and impots.gouv.fr from Blocked senders and domains, if listed.
Add the exact sender addresses, or those domains, to Safe senders and domains. https://support.microsoft.com/en-us/outlook/mail/block-or-unblock-senders-in-outlook
Check Settings > Mail > Rules for any rule that may delete or move these messages.
Then request another email from Ameli or Impôts. If it still does not arrive, ask them whether they received a delivery-failure message. The exact error code would show whether Outlook rejected the message.