Outlook is returning Remote Server returned '421 4.3.2 Service not available' for two of my groups.outlook.com groups

Anonymous
2022-06-28T02:36:22+00:00

* * * Mod note: See the post by Diane Poremsky MVP * * *

Yesterday and today outlook.com is refusing all group email.
I have two different groups that I use weekly. Today I get this message.'

The recipient's email system isn't accepting messages now. Please try resending your message later or contact the recipient directly.

Generating server: BN6PR19MB0962.namprd19.prod.outlook.com
Total retry attempts: 4

___@___.___
Remote Server returned '421 4.3.2 Service not available'

Original message headers:

Received: from SA0PR19MB4412.namprd19.prod.outlook.com (2603:10b6:806:ba::17)
by BN6PR19MB0962.namprd19.prod.outlook.com (2603:10b6:404:74::9) with
Microsoft SMTP Server (version=TLS1_2,
cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5373.18; Sun, 26 Jun
2022 19:00:06 +0000
Received: from DM4PR19MB6342.namprd19.prod.outlook.com (2603:10b6:8:a7::11) by
SA0PR19MB4412.namprd19.prod.outlook.com (2603:10b6:806:ba::17) with Microsoft
SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id
15.20.5373.18; Sun, 26 Jun 2022 18:59:37 +0000
Received: from DM4PR19MB6342.namprd19.prod.outlook.com

WHAT IS GOING ON WITH OUTLOOK GROUPS??

I create a NEW group to test and it ALSO returns the same error.

* Pinned until August 1, 2022.

Outlook | Web | Outlook.com | Contacts

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  1. Anonymous
    2022-07-04T20:02:52+00:00

    Same problem - started 23rd June 2022.

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  2. Anonymous
    2022-07-02T22:05:47+00:00

    On-going issue for me. Hard to pinpoint when it has started, but it has been going on two weeks. Please advise on ETA for a fix, so that I can understand how much time I need to invest in any work arounds.

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  3. Anonymous
    2022-07-02T11:35:06+00:00

    any update?

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  4. Anonymous
    2022-07-01T23:44:13+00:00

    ‎Delivery failed for these recipients or groups:‎

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  5. Anonymous
    2022-06-29T11:18:28+00:00

    Same problem i have. Please inform me when its fixed or how to fix it! Thank you

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