550 5.7.520 AS(4810) Outgoing emails blocked as spam

Question

550 5.7.520 AS(4810) Outgoing emails blocked as spam

David Hadley 0

My Outlook.com account is returning '550 5.7.520 Message blocked because it contains content identified as spam. AS (4810)'

This started after I secured my account following a hack. Even emails sent to myself are being blocked. Please review whether my account has an outbound spam restriction and advise how to restore normal sending.

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Answer 1

Emma1-N 14,895 Microsoft External Staff Moderator

Welcome David Hadley,

Thank you for posting on Microsoft Q&A. I'm sorry your account was hacked, and I understand how frustrating it is that you still can't send email after securing it.

The error "550 5.7.520 … AS (4810)" means Outlook.com is treating your outgoing messages as spam. After an account is hacked, this often happens because spam was sent from the account. 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.

First, could you tell me:

About when was the account hacked, and when did you change your password?
Does the error appear in Outlook on the web (outlook.live.com) as well as the Outlook app or your phone?
Did you get any message or banner in Outlook.com saying your account is blocked or limited?

Looking forward to your update.

David Hadley 0 Reputation points

2026-11-04T09:59:15.9966667+00:00

Thanks for the reply. The account was hacked on 1/11/26. I changed my password straight away and have also deleted and re opened the account.

The error occurs in Outlook on the web also.

I didn't get a banner saying my account is blocked. The notification of the error came when I tried to email myself.

I hope that helps.
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Emma1-N 14,895 Reputation points Microsoft External Staff Moderator

2026-11-05T04:40:14.46+00:00
Hello David Hadley,

Thank you for your update. Please try the step :test from a clean session

Open a new "InPrivate" window in Microsoft Edge, or a private window in another browser. Turn off any VPN or proxy, then sign in to Outlook.com.

Send one short plain-text message with no links, attachments or signature to an address you own at another provider, such as Gmail or Yahoo.

Send a second message to a contact you've emailed before.

Note which of the two messages, if either, is blocked, and when the error arrives (immediately or a few minutes later).
David Hadley 0 Reputation points

2026-11-05T10:47:26.87+00:00

I decided to use a local professional to sort out my laptop and he tells me that the only problem remaining is that `Microsoft are blocking my emails as spam as a result of the hack.

Do you know how long before that block is removed or if there is any way to expedite that?
Emma1-N 14,895 Reputation points Microsoft External Staff Moderator

2026-11-06T06:27:35.3666667+00:00

Hello David Hadley,

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.

Go to https://support.microsoft.com/contactus, type "Unable to send email" and select "Get Help". Then select "Contact Support" and follow the prompts to reach a live agent. See Unblock my Outlook.com account for the other support routes.