Mail Delivery Failed - Outlook recipient
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- Mail Delivery Failed - Outlook recipient
Mail Delivery Failed - Outlook recipient
3 weeks ago
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I have been using PlusNet email for around 20 years, with a Thunderbird client on my Windows PC, currently still on a stable Window 7 version. I am a user@username.plus.com user, so directly with PlusNet.
Yesterday morning, for the first time, I received the following message:
Delivery to the following recipients failed permanently: * chrisgrose21@outlook.com Reason: A message that you sent to the following recipient could not be delivered due to a permanent error. ** The remote server ?? responded with: ** chrisgrose21@outlook.com ??:?? This message was created automatically by mail delivery software on the server .
Final-recipient: rfc822; chrisgrose21@outlook.com Diagnostic-Code: smtp; 550 5.7.515 Access denied, sending domain MAYPLACE.PLUS.COM doesn't meet the required authentication level. The sender's domain in the 5322.From address doesn't meet the authentication requirements defined for the sender. To learn how to fix this see: https://go.microsoft.com/fwlink/p/?linkid=2319303 Spf= Fail , Dkim= Pass , DMARC= Pass [GVYP280MB1070.SWEP280.PROD.OUTLOOK.COM 2025-06-17T08:47:16.043Z 08DDACF957D06E1B] [DUZPR01CA0315.eurprd01.prod.exchangelabs.com 2025-06-17T08:47:16.059Z 08DDAA1C7F3E2F05] [DB5PEPF00014B99.eurprd02.prod.outlook.com 2025-06-17T08:47:16.058Z 08DDA99F4C57979C]
The linked Microsoft fix was incomprehensible to me, so I turned to this site. I found a number of threads relating to a similar problem on GMail, although most of the discussion related to users with their own domains hosted by PlusNet. Nevertheless, I found some useful information, and changed my SMTP relay.plus.net settings to port 587, connection security to STARTTLS and Authentication method to Normal Password. I left User Name unspecified, since it hadn't been mentioned as part of the problem resolution. However, this hasn't solved the problem. I still get messages to outlook users (and one live.co.uk user) failing delivery.
Can anyone please help me fix the problem, and perhaps know what Microsoft (presumably) did yesterday to cause it?
Re: Mail Delivery Failed - Outlook recipient
3 weeks ago
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Microsoft have broken many third party email services... the business is examining matters.
In another browser tab, login into the Plusnet user portal BEFORE clicking the fault & ticket links
Superusers are not staff, but they do have a direct line of communication into the business in order to raise issues, concerns and feedback from the community.
If this post helped, please click the Thumbs Up and if it fixed your issue, please click the This fixed my problem green button below.
Re: Mail Delivery Failed - Outlook recipient
3 weeks ago
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Hi - My dad is having the exact same problem - he's uses his email to organise upcoming events in the town and has been unable to send emails to all customers/suppliers who are under the Microsoft banner - really hoping there is a simple fix as he's 77 and not tech savvy and I live 200 miles away from him.
Re: Mail Delivery Failed - Outlook recipient
3 weeks ago
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@Jaclyn1 wrote:
...hoping there is a simple fix...
The topic linked to in the previous post is long but to understand why there is no simple fix that users can implement you need to read it all.
Yes, it's a massive pain but users can only wait until either email providers like Plusnet can come up with a fix and/or Microsoft adjust the requirements that has caused this outage.
Re: Mail Delivery Failed - Outlook recipient
3 weeks ago
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Hello Mayplace and Forum members,
I have the same issue: Fix NDR error 550.5.7.515 in Outlook.com
I discovered it today Thursday 19th June 2025 and is the same as reported elsewhere.
On my system, it affects just "To" Outlook.com and doesn't affect the HCC Library public access computers.
eMClient and Thunderbird are affected similarly. Might be a Windows Update doing the wrecking.
Possibly a Microsoft problem.
Nothing much that I can repair: the description forming a solution is drowning in a mess of technical terms.
Good luck!
SimonFastEddy
Re: Mail Delivery Failed - Outlook recipient
3 weeks ago
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@SimonFastEddy wrote:
..Might be a Windows Update doing the wrecking.
Possibly a Microsoft problem.
Not a Windows Update problem but it is caused by something Microsoft has done.
Read my post, the one immediately above yours.
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