Hi all, I’ve been receiving an unusual message when I try to send an email from my Outlook.com account. The error says: "Remote server returned '550 5.7.520 Message blocked because it contains content identified as spam. AS(4810)'" I’ve tried various solutions, such as: Sending emails in plain text Using my mobile device Using Outlook Classic Replying to emails without including previous messages I even sent an email to myself and received the same error. Could it be that I'm accidentally sending spam to myself? Any suggestions would be greatly appreciated!

Hi @ Ida Cheung Welcome to our forum! What is the version of your Outlook? It is recommended that you please check the Outlook client version ( File>Office Account>Product Information ) and try to upgrade to the latest version to see if the problem is resolved. Does the issue occur recently on Outlook Desktop Client? To further confirm if the issue is more related to Outlook desktop client, if possible, please log in to your web mail and do the same test to check if the issue persists. Do you have any specific operation before the issue occurred? Whether there was a problem sending a message with attachments or a regular text message？ If the issue occurred when you send an email with an attachment, it is suggested that please convert the attachment to a compressed package（.zip） and resend it to see if the problem persists. If the issue occurred when you send a regular text message, as a workaround, you may edit the message on your computer, save it as a draft and then send it from your phone. In addition, i find a similar thread that many people find it useful, please feel free to refer to. Hope it helps. If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment". 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.

I got "Remote server returned '550 5.7.520 Message blocked because it contains content identified as spam. AS(4810)'", even sending email to myself !?

Ida Cheung 0

Hi all,

I’ve been receiving an unusual message when I try to send an email from my Outlook.com account. The error says:

"Remote server returned '550 5.7.520 Message blocked because it contains content identified as spam. AS(4810)'"

I’ve tried various solutions, such as:

Sending emails in plain text
Using my mobile device
Using Outlook Classic
Replying to emails without including previous messages

I even sent an email to myself and received the same error.

Could it be that I'm accidentally sending spam to myself?

Any suggestions would be greatly appreciated!

1 answer

Joan Hua-MSFT 3,640 Reputation points Microsoft Vendor

2024-12-11T02:33:04.6733333+00:00
Hi @Ida Cheung

Welcome to our forum!

What is the version of your Outlook? It is recommended that you please check the Outlook client version (File>Office Account>Product Information) and try to upgrade to the latest version to see if the problem is resolved.

Does the issue occur recently on Outlook Desktop Client? To further confirm if the issue is more related to Outlook desktop client, if possible, please log in to your web mail and do the same test to check if the issue persists.

Do you have any specific operation before the issue occurred? Whether there was a problem sending a message with attachments or a regular text message？

If the issue occurred when you send an email with an attachment, it is suggested that please convert the attachment to a compressed package（.zip） and resend it to see if the problem persists.

If the issue occurred when you send a regular text message, as a workaround, you may edit the message on your computer, save it as a draft and then send it from your phone.

In addition, i find a similar thread that many people find it useful, please feel free to refer to.

Hope it helps.

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

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.
Please sign in to rate this answer.
Ida Cheung 0 Reputation points

2024-12-11T04:09:55.5166667+00:00

Hi Joan,

Thanks for your advice, but it still isn't working well.

I have tried the following:

Outlook Desktop Client - New Outlook

Outlook Desktop Client - Classic Outlook

Outlook on the web (using Edge and Chrome)

Outlook on mobile (iOS)

I updated the Outlook Desktop Client (Classic) to the latest version. I then sent an email to myself with a normal Word document, and it worked.

However, when I sent an email with the same Word document, which was previously rejected, it failed again with the same error message.

This issue has been ongoing for a while. I have sent emails to different people, and many of them fail. My workaround is sending emails in plain text, or I have to write a new mail without the pervious mail. but it doesn't always work.

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Joan Hua-MSFT 3,640 Reputation points Microsoft Vendor

2024-12-11T05:41:00.71+00:00

Hi @Ida Cheung

Thanks for your response.

As a temporary workaround, you might try sending the email from another different outlook.com account to see if the issue persists.

If the issue persists, please check the content of your attachments, sometimes, specific content within attachments can trigger spam filters. Try modifying the content slightly or saving the document in a different format (e.g., PDF) and see if that helps.

If the issue doesn't persist, it seems that the issue maybe more related with your outlook.com account, it is suggested that you could post your case in dedicated forum for Outlook.com for more professional advice.

Hope it helps.

Joan Hua-MSFT 3,640 Reputation points Microsoft Vendor

2024-12-13T01:48:51.3533333+00:00

Hi @Ida Cheung

Just checking in to see if above information was helpful. If it is useful, would you mind marking the helpful post as an answer? Which would benefit others who also has similar issues in forum.

Warm thanks！

Ida Cheung 0 Reputation points

2024-12-13T05:47:07.5133333+00:00

Hi Joan,

Thank you for following up.

I’ve updated Outlook (Classic) and sent an email to 3 Outlook addresses. However, the situation remains unchanged.

I am still only able to copy and paste messages and send PDF files. I am unable to reply directly to messages, which is quite inconvenient for me.

Deleted

This comment has been deleted due to a violation of our Code of Conduct. The comment was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information.

Joan Hua-MSFT 3,640 Reputation points Microsoft Vendor

2024-12-17T05:27:04.1766667+00:00

Hi @Ida Cheung

Thanks for detailed description.

Have you tried using another outlook.com account? Based on my research, outlook.com account works fine, therefore, it seems not to be a general issue.

If you switch to another account and can send the attachment that was errored before, it may be more related to your account, it is suggested that you could post your case in dedicated forum for Outlook.com for more professional advice.

If you still can't send the attachment that was errored before, then please double-check your attachment for any illegal information and change the attachment to another file format (e.g. PDF or .zip) and try resending it to see if the issue persists.

Hope it helps.
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I got "Remote server returned '550 5.7.520 Message blocked because it contains content identified as spam. AS(4810)'", even sending email to myself !?

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