email blocked

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email blocked

STEWART HENDERSON 0

Since yesterday, ,my email is not sending out emails, indicating its blocked / containing spam

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Answer 1

Chloe-V 7,895 Microsoft External Staff Moderator

Hi STEWART HENDERSON,

Welcome to Microsoft Q&A forum.

I understand this issue is frustrating and I’ll help you narrow it down.

To better isolate the problem, could you please confirm:

Are you using a personal Outlook.com account or a work/school account (Microsoft 365)?
Are you using Classic Outlook or the New Outlook / Outlook on the web?
When sending emails, do you receive any bounce-back message or delivery report? If yes, please share the exact message via private message for security reasons.

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In the meantime, please try these basic steps:

Sign out and sign back in.
Try Outlook in an InPrivate/Incognito window.
Clear browser cache and cookies, then reload.
Try a different browser or device.

Let me know how it goes and I’ll guide you further.

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.

STEWART HENDERSON 0 Reputation points

2026-05-17T14:21:07.38+00:00

Hi, it is a personal Outlook (MSN) account, the issue is quite simple, the sending was blocked due to 'over usage', because I use it for beyond personal, also business. I'll try to use my other account's for business related topics but I need to have the block lifter on the MSN account (sending). Generating server: [Moderator Note: Personal Info Removed]

******@outlook.mail.microsoft Remote server returned '554 5.7.0 < #5.7.520 smtp;550 5.7.520 Message blocked because it contains content identified as spam. AS(4810)>'
Chloe-V 7,895 Reputation points Microsoft External Staff Moderator

2026-05-18T00:09:26.9233333+00:00
Hi STEWART HENDERSON,

Please note that our forum is a public platform, and we will modify your question to hide your personal information in the description. Kindly ensure that you hide any personal or organizational information the next time you post an error or other details to protect personal data.

Based on the details you shared, your personal Outlook account has likely been temporarily restricted from sending due to high usage and content being flagged as potential spam (AS4810).

To help resolve this, please try the following:

Pause sending emails for 24–48 hours to allow the restriction to lift.

Avoid sending bulk or repetitive messages, especially with similar content or multiple links.

Review your message content and remove anything that may be flagged (e.g., too many links or attachments).

Try sending a simple test email in plain text format to check if sending is restored. You can refer to this guide: Change the message format to HTML, Rich Text Format, or plain text in Outlook

Please feel free to let me know if you have any further updates, thanks

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