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

Carl Pullen 500 Reputation points
2023-04-08T10:28:04.19+00:00

Remote server returned '550 5.7.520 Message blocked because it contains content identified as spam. AS(4810)' Today i have received an email returned as spam. This was from an addressee who I correspond mostly, being a family member and I was sending them an important document. Both of these are Microsoft accounts (Hotmail and Outlook), both accounts are listed under my family 365 account, both using Microsoft Outlook and no other system for sending and receiving emails. Can you tell me why this is the case and how I am able to stop this in the future?

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  1. Stephen Z 105 Reputation points
    2023-11-06T11:21:22.39+00:00

    Update 22:30 6/11/2023 AEDT (GMT+11)

    I have read through all comments. It seems like this problem only happens on the web client (outlook.com in browser and "New Outlook App", which is essentially an outlook.com PWA).

    I have personally tried using the Outlook app on my Android phone. It works without any issue.

    And as ALAN stated on 22:19 6/11/2023 AEDT (GMT+11):

    If this helps anyone. You can send emails with attachments. But only through the Mail desktop app "switched to old outlook" it will not send if switched to new app. Hopefully Microsoft will have this issue sorted soon!

    The old Outlook app (a real app) on PC is unaffected as well.

    Temporary Solution

    So, so far if anyone is affected by this issue, try using the mobile app or the classic UWP outlook app instead. And please share your experience below if possible. (I have not yet tested the Outlook app bundled with Office, which in theory should also work)

    Hopefully it helps with anyone who is experiencing the issue.

    Original Answer

    Same things happening today. I'm in Australia. I've conducted some tests. As long as the email contains any attachment, it cannot be sent through.

    From To Result
    Outlook to Outlook Rejected by "recipient's email provider"
    Outlook to Gmail Rejected by "recipient's email provider"
    Gmail to Outlook Success
    Gmail to Gmail Success

    Considering the result above, I would highly doubt the emails were "rejected by recipient's email provider". I would rather believe they did not pass the Outlook's spam check before sending out.

    19 people found this answer helpful.
  2. ALAN 35 Reputation points
    2023-11-06T12:24:17.58+00:00

    Another workaround for everyone while the problem persists. Set up you email and attachments via the browser outlook. Save to drafts. Then send it from phone app. That also works.

    6 people found this answer helpful.
  3. Gina B 5 Reputation points
    2023-06-10T17:00:27.2033333+00:00

    Try resending the message that got hit with this as Plain Text (that will remove all links and URLs). I am using Outlook 2021 and an MSN account that have been seeing his issue occasionally. Re-sending the 'blocked' message in Plain Text format (not HTML or RTF) will usually get it to go through.

    1 person found this answer helpful.
  4. Līga Ozola 10 Reputation points
    2023-11-06T12:02:41.5466667+00:00

    I tried to send these e-mails from mobile app few minutes ago and it worked! All of them delivered.

    1 person found this answer helpful.
  5. PAUL BRUNO 5 Reputation points
    2023-11-06T16:14:12.7+00:00

    I just exported (saved) my PDF file as a JPG and I can send that format without getting the error message!

    1 person found this answer helpful.
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