Unable to send emails to Yahoo accounts

Anonymous

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.

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62 answers

Anonymous

2024-03-11T11:41:03+00:00

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
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Anonymous

2024-03-11T01:33:06+00:00

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
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Anonymous

2024-03-09T19:27:05+00:00

Just FYI, to make things even harder to track Microsoft's own failed email messages are being thrown into my Junk Email folder, so if you don't view the Junk Email folder, you will never know this is happening. Also, the time the message is returned is 24 hours later, so you won't know your message did not go through until 24 hours later, and even then the message letting you know will probably end up in the Junk Email folder.
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Anonymous

2024-03-09T19:22:10+00:00

Same issue here too. Just started happening at the same time as posted above. It does seem to be mostly with yahoo.com email addresses, but we have had a few other domains bounce back too.

98% of our emails are going through, but some are not, especially to Yahoo.

Until Microsoft fixes this issue, I recommend to my team that they assume no emails are getting through and text or call our clients if they do not reply to the email.
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