Outlook emails not deliverable to yahoo and aol

Anonymous

Starting this week, our emails to yahoo and aol accounts are not being delivered, but emails to other email accounts are working. Here is one of the yahoo error message: 1/12/2024 9:27:16 PM - Server at SJ2PR02MB10076.namprd02.prod.outlook.com returned '550 5.4.300 Message expired -> 421 4.4.2 Connection dropped due to SocketError' 1/12/2024 9:26:15 PM - Server at mta5.am0.yahoodns.net (67.195.204.73) returned '421 4.4.2 Connection dropped due to SocketError'

And here is the aol error message: 1/12/2024 9:27:38 PM - Server at PH0PR02MB7367.namprd02.prod.outlook.com returned '550 5.4.300 Message expired -> 421 4.4.2 Connection dropped due to SocketError'
1/12/2024 9:15:15 PM - Server at mx-aol.mail.gm0.yahoodns.net (67.195.204.80) returned '421 4.4.2 Connection dropped due to SocketError'

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Anonymous

2024-01-23T21:19:50+00:00

I have had these bouncebacks from Yahoo & AOL -- and also from verizon.net

Sometimes messages have gone through to the same people, though, in the same timeframe.
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Anonymous

2024-01-24T11:29:13+00:00

We are also having issues we can receive mails but not send .....This is causing us major issue!
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Anonymous

2024-01-24T14:09:40+00:00
Starting this week, our emails to yahoo and aol accounts are not being delivered, but emails to other email accounts are working. Here is one of the yahoo error message: 1/12/2024 9:27:16 PM - Server at SJ2PR02MB10076.namprd02.prod.outlook.com returned '550 5.4.300 Message expired -> 421 4.4.2 Connection dropped due to SocketError' 1/12/2024 9:26:15 PM - Server at mta5.am0.yahoodns.net (67.195.204.73) returned '421 4.4.2 Connection dropped due to SocketError'

And here is the aol error message: 1/12/2024 9:27:38 PM - Server at PH0PR02MB7367.namprd02.prod.outlook.com returned '550 5.4.300 Message expired -> 421 4.4.2 Connection dropped due to SocketError'
1/12/2024 9:15:15 PM - Server at mx-aol.mail.gm0.yahoodns.net (67.195.204.80) returned '421 4.4.2 Connection dropped due to SocketError'

Greetings,

I am getting the same problem with emails to the "@rogers.com" domain, a YAHOO offshoot account.

Diagnostic information for administrators:

Generating server: CH3PR15MB5843.namprd15.prod.outlook.com
Receiving server: CH3PR15MB5843.namprd15.prod.outlook.com
Total retry attempts: 4

***********email address removed **********
1/24/2024 11:52:06 AM - Server at CH3PR15MB5843.namprd15.prod.outlook.com returned '550 5.4.300 Message expired -> 421 4.4.2 Connection dropped due to SocketError'
1/24/2024 11:33:52 AM - Server at mx-rogers.mail.am0.yahoodns.net (67.195.204.82) returned '421 4.4.2 Connection dropped due to SocketError'

Original message headers:
```
Received: from BLAPR15MB3905.namprd15.prod.outlook.com (2603:10b6:208:271::9)

 by CH3PR15MB5843.namprd15.prod.outlook.com (2603:10b6:610:124::5) with

 Microsoft SMTP Server (version=TLS1_2,

 cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7228.22; Wed, 24 Jan

 2024 10:02:01 +0000

Received: from CY8PR15MB5579.namprd15.prod.outlook.com (2603:10b6:930:9a::19)

 by BLAPR15MB3905.namprd15.prod.outlook.com (2603:10b6:208:271::9) with

 Microsoft SMTP Server (version=TLS1_2,

 cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7202.37; Tue, 23 Jan

 2024 22:58:49 +0000

ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none;
```
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Anonymous

2024-01-24T15:05:57+00:00

So far, we've encountered undeliverable emails to yahoo, aol, and now gmail, basically since 1/15/24 as far as we can tell. WTH???
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