My hotmail account (paid one) is not working properly- several messages bounced back

Question

My hotmail account (paid one) is not working properly- several messages bounced back

Graziella 0

Hello,

My hotmail account (both outlook for Mac and web version) is not working properly since over two weeks, several message are bouncing back. I find the notification in my junk folder. This happens, mostly when I use the reply function, but also when I send new mails.

I tried everything that was recommended by other users and yet I still face this problem.

My hotmail account is the one I use for my profession and this problem delays enormously my work.

I get this message" Remote server returned '550 5.7.520 Message blocked because it contains content identified as spam. AS(4810)'". It happens with several users, so it is not linked to a specific recipient.

I am really annoyed and unhappy by the lack of online support. I have a lot of storage space and as mentioned above is a paid one.

Can someone help?

Thank you,

PII Removed

1 answer

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Answer 1

Sin-D 4,435 Microsoft External Staff Moderator

Hi Graziella,

Thank you for posting on the Microsoft Q&A Forum. I understand you’ve been experiencing bounced messages over the past two weeks. Please try the following steps to resolve the issue:

1, Switch the email format to Plain Text:

Legacy Outlook for Mac: New Email > Options tab > Switch to Plain Text.
Outlook on the web/New Outlook: Settings > Compose and reply > Message format > Compose messages in Plain text format. This often bypasses AS(4810) for replies containing heavy HTML, long threads, or signatures with images.

2, If attaching PDF/JPG/PNG files:

Zip the file first, or
Share via OneDrive and include a view-only link instead of attaching.

These two patterns have proven effective during spam‑filter spikes.

The initial response might not address the problem. So, if your problem persists or you need any assistance, feel free to ask me by clicking "Add Comment". Thanks for your effort.

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.

Best regards.

Sin-D 4,435 Reputation points Microsoft External Staff Moderator

2025-11-04T06:39:40.07+00:00

Hi Graziella,

I just wanted to check in and see if the steps worked for you. If you need any further assistance, don’t hesitate to reach out by clicking "Add Comment" or "Post Answer" (If you cannot add comment)! This helps me can read your follow up! Thank you.
Graziella 0 Reputation points

2025-11-04T15:31:39.68+00:00

Hello,

Thank you for taking the time to answer and provide this piece of advice. Unfortunately, I had already tried the plain text option and did not work. I tried to check again and yes it is set plain text. Yet this morning again one of the emails bounced back.

Any other pieces of advice?

Best,

PII Removed
Sin-D 4,435 Reputation points Microsoft External Staff Moderator

2025-11-05T02:06:49.2166667+00:00

Hi Graziella,

Can I confirm if this is a recent problem that you haven’t experienced before, even when sending emails with PDF attachments? Also, did you recently change your device or remove a device? If so, please try resetting your password using this link: https://account.live.com/ResetPassword.aspx

If you need any assistance, feel free to ask me.
Graziella 0 Reputation points

2025-11-05T13:50:43.3933333+00:00

Hello Sin-D

This problem started around three weeks ago. I have had this account for over 20 years and it never happened before.

Now is happening a bit less, but still happening with key interlocutors for my work with whom I have been corresponding for over a year now.

Thank you for any advice.

PII Removed
Sin-D 4,435 Reputation points Microsoft External Staff Moderator

2025-11-08T07:13:16.06+00:00

Hi Graziella,

Thanks for your follow-up and sorry for the late response. I want to clarify and hope you can provide more information for me.

First, I really hope you can answer my question about the PDF attachment to help me categorize your issue.

If it’s not about the PDF attachment, can I ask about some recipients? Do they have something special (such as using a third-party domain, e.g., @gmail.com or @3rdmail.com)? I want to ask this because your account might be flagged by a third-party mail provider.

Lastly, if you don’t mind, I hope you can change your password. The issue might be cleared on your side, but old credentials could keep it continuing. Resetting your password can help your account refresh its credentials.

Thanks for your efforts, and I really hope for your follow-up.

Best regards.

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My hotmail account (paid one) is not working properly- several messages bounced back

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