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Suddenly not able to receive emails from a yahoo account

Carlos Anon 0 Reputation points
2026-05-10T12:43:48.2533333+00:00

I haev a live.com.au email account for 20 odd years at this point, my wife uses yahoo for about 20 year too. We've never had issues being able to send emails to each other back and forth, however just 1 or 2 weeks ago out of nowhere, she will be able to receive my emails but I can't get any of hers. The image below is a screenshot of the bounceback error she is getting.

Is anyone able to tell me what this error actually means and how I can fix the issue? She gets it regardless for both using the home internet or her phone's data.
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  1. Hornblower409 8,635 Reputation points
    2026-05-11T13:49:40.97+00:00

    @Carlos Anon said

    Is anyone able to tell me what this error actually means and how I can fix the issue?

    Microsoft has put your wife's Yahoo account on it's Blocked List. It will not deliver any emails from that account to your live.com.au account until the block is removed. There is nothing you can do from your end to fix this. It's being blocked by the Microsoft Mail Servers before it even reaches your Outlook client.

    If Yahoo can't offer any help, you can request the Yahoo account be de-listed yourself at https://sender.office.com/

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  2. Q&A Assist
    2026-05-10T12:44:00.97+00:00
    AI generated content. This question contains an answer created with AI from Q&A Assist. Learn more

    The error in the screenshot means that Outlook.com is rejecting messages coming from the IP address used by the Yahoo server that handled the mail. The key part is:

    550: 5.7.1 Unfortunately, messages from [34.2.94.17] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150).

    Explanation:

    • 550 5.7.1 is a permanent failure: the receiving server refused the message.
    • Outlook.com has put the sending IP address (34.2.94.17) on a block list, usually because it has recently sent spam or suspicious traffic.
    • This is why messages from the Yahoo account to the live.com.au address suddenly stopped working, even though replies in the other direction still work.

    What can be done:

    1. Because the block is on the sending side, the owner of the blocked IP (Yahoo or its mail provider/ISP) must fix it.
    2. Ask the Yahoo account holder to contact Yahoo support and provide the full bounce message, including the IP address and the S3150 code, so Yahoo can investigate and get the IP removed from Outlook.com’s block list.
    3. If other senders using Yahoo (or the same network) also cannot send to Outlook.com addresses, that further confirms it is a provider‑side reputation/block‑list issue, not a problem with the live.com.au mailbox.

    There is no setting in Outlook.com or the live.com.au account that can override this; it has to be resolved by the provider whose IP is blocked.

    References:

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