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

Anonymous

* * * 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.

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

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52 answers

Anonymous

2022-07-05T10:18:33+00:00

Can we please have an update on this issue - silence is unacceptable
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Anonymous

2022-07-05T02:24:51+00:00

I have had this same problem for more than 10 days. Tried creating a new group, but the same problem.

Is anyone in Microsoft even looking at this problem? This has been working fine for many months now, so it is a little surprising (1) that this has happened; and (2) they are taking so long to fix it.

Does anyone know of any workarounds?

Thanks.
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Anonymous

2022-07-04T20:02:52+00:00

Same problem - started 23rd June 2022.
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Anonymous

2022-07-02T22:06:06+00:00

Nothing
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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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