Emails are being bounced back, socket error

Emails that I am sending to certain accounts are bouncing back with a "socket error" from Microsoft.  It seems to happen mostly to Yahoo email accounts, but is also affecting other emails as well (but not all). The bounce-back error message is not immediate but sometimes comes back to me a day or two after the original email was sent. 

We are using Windows 11 and Microsoft 365 Business (Outlook) as our email program. 

Here is a copy of the error message...

Delivery has failed to these recipients or groups:

mcbridets@frontier.com (mcbridets@frontier.com)
Your message couldn't be delivered. Despite repeated attempts to contact the recipient's email system it didn't respond.

Contact the recipient by some other means (by phone, for example) and ask them to tell their email admin that it appears that their email system isn't accepting connection requests from your email system. Give them the error details shown below. It's likely that the recipient's email admin is the only one who can fix this problem.

For more information and tips to fix this issue see this article: https://go.microsoft.com/fwlink/?LinkId=389361.

Diagnostic information for administrators:

Generating server: DS0PR18MB5412.namprd18.prod.outlook.com
Receiving server: DS0PR18MB5412.namprd18.prod.outlook.com
Total retry attempts: 4

mcbridets@frontier.com
2/1/2024 9:36:20 PM - Server at DS0PR18MB5412.namprd18.prod.outlook.com returned '550 5.4.300 Message expired -> 421 4.4.2 Connection dropped due to ConnectionReset'
2/1/2024 9:16:20 PM - Server at mta7.am0.yahoodns.net (98.136.96.91) returned '421 4.4.2 Connection dropped due to ConnectionReset'

Original message headers:

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bh=rxLAOSLqkbWx3fnKDsfVy8FcOsYAOiApKSGmssPZpKU=; b=FpOdVe/iND8GQYw+hjNPcmhDf8ygoC8CjZlu9CoU5MO6+e/uRcs7l6gpTnqh1YuO4qtg3VVJyjfcqJ+UtdH3eF91ICeX8cvVaEV7aQWpHbRfedpWprKZOQcIaF9GqpTzybTv0OiXI4aeuaGvlcM4yDRl9SoiLr83rB+rZYAIlmk=Received: from DM6PR18MB3403.namprd18.prod.outlook.com (2603:10b6:5:1cc::28) by LV8PR18MB5730.namprd18.prod.outlook.com (2603:10b6:408:1f6::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7249.24; Wed, 31 Jan 2024 21:36:19 +0000Received: from DM6PR18MB3403.namprd18.prod.outlook.com ([fe80::7488:5913:9ee:2789]) by DM6PR18MB3403.namprd18.prod.outlook.com ([fe80::7488:5913:9ee:2789%7]) with mapi id 15.20.7249.017; Wed, 31 Jan 2024 21:36:19 +0000From: Douglas Anderson <danderson@waynecfb.com>To: "mcbridets@frontier.com" <mcbridets@frontier.com>Subject: 2024 Feb 1 - Rotary Agenda.pdfThread-Topic: 2024 Feb 1 - Rotary Agenda.pdfThread-Index: AdpUjYYCfAx5NpntSiupdVGabU7FQA==Importance: highX-Priority: 1Date: Wed, 31 Jan 2024 21:36:19 +0000Message-ID: <DM6PR18MB3403A801C0E070E16735E7E4DC7C2@DM6PR18MB3403.namprd18.prod.outlook.com>Accept-Language: en-USContent-Language: en-USX-MS-Has-Attach: yesX-MS-TNEF-Correlator:authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=waynecfb.com;x-ms-publictraffictype: Emailx-ms-traffictypediagnostic: DM6PR18MB3403:EE_|LV8PR18MB5730:EE_|IA1PR18MB5448:EE_|DS0PR18MB5412:EE_x-ms-office365-filtering-correlation-id: a13529ec-fbc6-40fa-4790-08dc22a4a96dx-ms-exchange-senderadcheck: 1x-ms-exchange-antispam-relay: 0x-microsoft-antispam: BCL:0;x-microsoft-antispam-message-info: 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-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DM6PR18MB3403.namprd18.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031)(366004)(39830400003)(136003)(346002)(396003)(376002)(230922051799003)(451199024)(1800799012)(64100799003)(186009)(9686003)(41300700001)(38100700002)(26005)(122000001)(5660300002)(99936003)(52536014)(8676002)(8936002)(9326002)(71200400001)(66946007)(478600001)(6506007)(76116006)(2906002)(7696005)(64756008)(66446008)(66476007)(66556008)(6916009)(316002)(38070700009)(86362001)(558084003)(33656002)(55016003);DIR:OUT;SFP:1102;x-ms-exchange-antispam-messagedata-chunkcount: 1x-ms-exchange-antispam-messagedata-0: =?us-ascii?Q?yc4O6bxzaqfXy75wmbTYJBF8F1rcLVZBneDcFVNawCJG7OSVxa7R4EyWGZp8?= =?us-ascii?Q?tKNrBOa72tVl4QzIK2ysSKHGpcrU1Sv50kw6UJX4RoVfEAPzjx/bIot6jEti?= =?us-ascii?Q?k1e9sajpRaQ0iA7bkSGjVB9SDd4K24Xv8F67wbMMEow8HkkX9hTOgHuCu/Af?= =?us-ascii?Q?SuoGr/eKDcLmzq9dxGQGkZihutcMbXUltAbyssNc1scGPwGm2vJtt77vsR6b?= =?us-ascii?Q?OSYh7CJRo+O/XcC9HCb3YKWIy/fvZJOjWDP46xVDjFb030gWnQmWTlRiP3OH?= =?us-ascii?Q?evxi8UvxQ+iYECSpAf92cc6R44FvBnnQGQBNIxqImxCk7OdOhmdp27IA20WK?= =?us-ascii?Q?nENxOdR+fjYFRrkhLg8tDD6mLyJY50ZXB2pBokQV4wOMIGUX3ec8rKLrKxTn?= =?us-ascii?Q?oU9m/3H1XxkUITPbQzZBOXuIAM1aw69K9mbkvJqX26yEmbroEXUFTrclSYZp?= =?us-ascii?Q?mev/0DkadXv4P+adVnm1fsd8KT7G0opX32x3/Q3FNeqktVOCdLeQsVC7KJYz?= =?us-ascii?Q?t5YCL9EZQlkbS9oUYsr1epuDNPfS6o6mO8Yphtvc0elmgEgNKDggpLtHVUIF?= =?us-ascii?Q?VoHk8O72ivstr93vQL9+7wVOuhKPMReXMMTsEZu44fMjFQ5m8Nyq3RKQPZ+o?= =?us-ascii?Q?CusNVBlIGCtDx4ojpav+2zTgPaD8m2JHgVX8Z964a8PZ/UBtloU1xcVmbTGD?= =?us-ascii?Q?Q7mzhGsvjRTjZvi68BElL84BLxYDUoBl36ozPUSp58A4I7vZwOl7bn7dnBEo?= =?us-ascii?Q?H4T+VlKnqELPTlUlZtTt4Z9ihy1RcTyYuScW64p6SqZYh3R2nyb3MdSNVeia?= =?us-ascii?Q?pFsn1zRhveor9o2DyG7SIu+fXv72y72qYXEollmNU6L+s5H8IEbBLTAxq6JL?= =?us-ascii?Q?4td2qiMvbhP5gk73z1jyuNDLUxSW3U33pEPEF67Cml+h9BUAmyUG5ugjzQPK?= =?us-ascii?Q?a44NXeEG9c9iMh8AG5/YdA6DIUnZxzykce0nbXndu4axoZOtN8B51ynBvUhp?= =?us-ascii?Q?GQWPX1SZ1ZVQccRhBdJRjycijiU+AeKaCTUSzCRZJmNC5/c8beroCG6XtFFd?= =?us-ascii?Q?vloCcKBw8L7aiXFjVbYJ795iAGCR9xcLwbmiDLJqMzI94TnAhvSu2wHvkWo7?= =?us-ascii?Q?r/6FKmuQvlChg3BKxXuRKUs8v/oyQAp+jxb2ZvlTnZDEIs/4oES/Vvm+7Ef4?= =?us-ascii?Q?52hEviLGOiclNMqJDfAvWpxvdrkYC4R9khb2sW9SlL9cE6yuYm+Jd+YRaML7?= =?us-ascii?Q?2DLNU2NjANe8NYn0D0wF2aqktLpLF8avdPHiswVWiGXkZvbu6jmKJQycUmGL?= =?us-ascii?Q?Kl0sup65eyIPjt88GbzSyY+ZTAUxULSGpsPKAp0F3OmMnAEGsi5RgKoCjkyK?= =?us-ascii?Q?mWO7EVW+RlK2J8WtusiE1pFdWgEXkuoyuAKn3C+oAFZgBub2awyvZYMHJ9zv?= =?us-ascii?Q?OxJO9C08D3EhHKEfMWczs0b6a+dzHoCegCR5mtF9C+7DFyqp5x3TFkad/Ljl?= =?us-ascii?Q?5vgCeT/9KNfQnzKERG+fbGNPNYG9DUuV6ZxEfTIo8QVVw5umUyqdGtSXUHZi?= =?us-ascii?Q?sJC4e7fcCxdXmxleeXSrH3b1HND8UhfYaUQOVR5U?=Content-Type: multipart/mixed; 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