Account blocked from sending ALL email 5.7.520 for 4+ days

Question

Been trying to "Get Help" for an hour now but the support system created has me going in circles so it has resorted to making a post about it.

"554 5.7.520 AS(4810) ALL outbound email blocked"

For over 4 days I have not been able to send emails to anyone, not even myself. I'm begging you to fix this.

Answer 1

Thanks for your reply. Do you want to sign out from all devices or only this browser?

Select your profile picture at the top right, then choose Sign out. For all devices, go to your account page, open Security, then Advanced security options, and select Sign me out everywhere. Sign back in and test sending email again.

Answer 2

Hi,

Are you able to sign in to your account and view recent security activity?

This error usually means your account was flagged, so start by securing it. Sign in, go to your account security page, review recent activity, and confirm any unfamiliar sign ins. Then change your password and enable two step verification. After that, sign out of all devices and sign back in, then try sending again from the web version of Outlook. This helps clear blocks caused by suspicious activity and restores sending once the account is verified as safe.

Answer 3

The error 554 5.7.520 AS(4810) ALL outbound email blocked indicates the Outlook.com account has been blocked from sending mail due to suspected abuse or policy violation. This type of block cannot be cleared from the Outlook.com UI and requires Microsoft’s automated/unblock process.

For a consumer Outlook.com account, the supported paths are:

1. Use the Outlook.com unblock flow
   • Follow the guidance in Unblock my Outlook.com account. If the account has been flagged, the page will walk through the verification/unblock steps.
2. If the account itself is not blocked but mail is still blocked
   • The sending IP or source might be on a Microsoft block list. For consumer Outlook.com senders, use the Outlook.com delisting form referenced for consumer services:
   • Go to the delisting form for Outlook.com (consumer service) and submit a request with the required details. The form is linked as: “The delisting form for Outlook.com, the consumer service can be found here.”
   • Read the FAQ linked from that same section before submitting to ensure the request is correctly filled out.
3. If still blocked after following the unblock/delist steps
   • Use Outlook.com in-browser support:
     • Sign in to Outlook.com.
     • Select Help on the menu bar and enter the error text 5.7.520 or “ALL outbound email blocked”.
     • Scroll down to Still need help? and choose Yes to reach a support agent.
   • If sign-in is not possible, use the “If you can't sign in” link from the same support area.

These are the supported methods to remove an Outlook.com send/send-outbound block; forum moderators and community replies cannot directly lift the restriction.

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References:

• External senders - Use the delist portal to remove yourself from the blocked senders list and address 5.7.511 Access denied errors
• Unblock my Outlook.com account
• Unable to send emails from Outlook.com connected accounts from Outlook app