Web Outlook not receiving emails from certain senders

Question

Web Outlook not receiving emails from certain senders

Artur Cwik 0

I dont receive some emails from certain senders(language school) that are sent to me, I dont have any rules or black list sender set and have 10% occupied of storage for emails

I have proof that my other mail provider @ that was in CC has received @ correctly from the given sender while my outlook account mailbox hasn't

Year ago I have emails from them obtained correctly

I am almost 100% sure that is fault of Outlook

Have you started to use AI / regional black / block list tools to filter arbitrally some emails always?

UPDATE: Support has confirmed Outlook server is issued means Microsoft screwed a lot, nobody knows how much people realizes they might not receive some emails from given senders, Im really pissed of it

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Answer 1

Chloe-V 13,460 Pracownicy zewnętrzni firmy Microsoft Moderator

Disclaimer: I noticed that your locale is set to pl-PL, while your request was submitted in English. To ensure consistency and clarity, I will continue responding in English.

Hi @Artur Cwik

I’m sorry for the frustration this has caused, especially since the same messages were successfully delivered to the other email address included in CC and Microsoft Support has indicated that this may be a server-side issue.

Outlook.com uses automated anti-spam and sender-reputation filtering, and legitimate messages may occasionally be filtered unintentionally.

Please note that this is a user-to-user support forum. Moderators, contributors including external Microsoft employees cannot directly intervene in Microsoft product features or access back-end systems. Our role is limited to providing technical guidance on reported issues, requests, or ideas only.

Since you have already checked your storage, rules, Junk Email folder, and blocked senders, please continue following up through your existing Microsoft Support case. The language school should also ask its email administrator to retain any non-delivery report or SMTP error and submit the affected sending domain or IP address through Sender Support in Outlook.com.

I understand how serious this is when important emails disappear without any notification, and I hope the delivery issue can be properly traced using the sender’s mail logs.

Thank you for your understanding.

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Artur Cwik 0 Punkty reputacji

2026-09-13T11:07:17.8933333+00:00

Yeah, your "reputation" filters used perhaps accompanied by AI "trusted" but for sure NOBODY tested it well before going on production this year, its time to leave outlook.

Its your fault.

This is the worst possible bug you can ever have after not working mailbox at all

And Im going for transition to other email provider not having your rookie issues, plenty of market on it.

Perhaps start thinking from not screwing on your side rather tracing others because other prominent legit providers are ok for THE SAME emails that they have been sent in CC's

Enjoy your "process of doing things" right now. I know you cannot do anything around development but that level of mistakes always ending of collabaration and it is warning for other wanting to go for outlook what they really want & rely on internet mailboxes
Chloe-V 13,460 Punkty reputacji Pracownicy zewnętrzni firmy Microsoft Moderator

2026-09-14T23:41:27.8633333+00:00

Hi @Artur Cwik

I completely understand how frustrating and disappointing this situation must be, especially when important emails were delivered successfully to another provider but never appeared in your Outlook.com mailbox. Missing messages without any warning can seriously affect your confidence in the service, and I’m truly sorry for the inconvenience and concern this has caused. Your frustration is entirely understandable.