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Starting a couple of days ago, I am unable to send emails to Yahoo accounts from my Outlook email. Here is the error message I receive:
Your message wasn't delivered. Despite repeated attempts to deliver your message, a connection to the remote server was closed abruptly.
Contact the recipient by some other means (by phone, for example) and ask them to tell their email admin that it appears that your email system is unable to connecto their 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 Email Admins
This often indicates the recipient's firewall SMTP fixup setting or other firewall settings are preventing the SMTP protocol negotiation from succeeding.
For more information and tips to fix this issue see this article: https://go.microsoft.com/fwlink/?LinkId=389361.
I went to the link suggested, and did not understand the instructions. Please assist. Thank you.
Using Classic Outlook on Windows for personal email, calendar, and contact management
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same problem here, taking 24 hours to let me know, only happening to yahoo clients. Both of them I have previously sent email to. thanks
Dear Pam Younghans,
Thank you for visiting Microsoft Community, we are glad to assist you here.
Please kindly note this is a known issue as Yahoo made an authentication change, requiring email senders to strongly authenticate their emails following well-established best practices such as DMARC, SPF, and DKIM.
Please follow the steps to enable it as below:
Set up SPF identify valid email sources for your Microsoft 365 domain | Microsoft Learn
How to use DKIM for email in your custom domain | Microsoft Learn
Use DMARC to validate email, setup steps | Microsoft Learn
Email authentication in Microsoft 365 | Microsoft Learn
For your reference:
Authenticate Outbound Email to Improve Deliverability - Microsoft Community Hub
If still same issue, it is suggested to open ticket and contact Microsoft Technical team Get support - Microsoft 365 admin | Microsoft Learn to get further assistance on this query.
Thank you for your time.
Please feel free to get back to us if you have further concerns,
Regards,
Microsoft Community
When is microsoft going to fix this problem, since we are all having the same issue? It is not reasonable to expect every user to be able to resolve this using the specified instructions.
This answer has been deleted due to a violation of our Code of Conduct. The answer was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information.
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Adding DKIM, like Ankita mentioned, fixed the problem for me.
How to use DKIM for email in your custom domain | Microsoft Learn