Sending, receiving, and organizing email in Outlook.com
Hi, @amma djan
If you haven't tried it yet, first, check your Junk Email folder and search for one of the missing senders in Outlook Web https://outlook.live.com/mail using another device or internet connection source.
Also check Settings > Mail > Rules and Settings > Mail > Forwarding to make sure nothing is moving or forwarding your messages.
If the issue still persists, to help narrow down the issue:
- Are you missing emails from all senders, or only certain email addresses/domains?
- Do the senders receive any bounce-back or delivery failure message when they email you?
Click "Add comment" to let me know.
Thanks!